diff --git a/.env b/.env
index 7c027d7713..d0bb7ec0d8 100644
--- a/.env
+++ b/.env
@@ -9,7 +9,6 @@ EXAMS_BASE_URL=''
 FAVICON_URL=''
 LANGUAGE_PREFERENCE_COOKIE_NAME=''
 LMS_BASE_URL=''
-PREVIEW_BASE_URL=''
 LEARNING_BASE_URL=''
 LOGIN_URL=''
 LOGO_TRADEMARK_URL=''
diff --git a/.env.development b/.env.development
index 31c11a560f..045c52f2df 100644
--- a/.env.development
+++ b/.env.development
@@ -42,4 +42,3 @@ HOTJAR_VERSION=6
 HOTJAR_DEBUG=true
 INVITE_STUDENTS_EMAIL_TO="someone@domain.com"
 AI_TRANSLATIONS_BASE_URL='http://localhost:18760'
-PREVIEW_BASE_URL='http://preview.localhost:18000'
diff --git a/.env.test b/.env.test
index 6a6b7d4dd0..67ad2994bb 100644
--- a/.env.test
+++ b/.env.test
@@ -8,7 +8,6 @@ EXAMS_BASE_URL=
 FAVICON_URL='https://edx-cdn.org/v3/default/favicon.ico'
 LANGUAGE_PREFERENCE_COOKIE_NAME='openedx-language-preference'
 LMS_BASE_URL='http://localhost:18000'
-PREVIEW_BASE_URL='http://preview.localhost:18000'
 LEARNING_BASE_URL='http://localhost:2000'
 LOGIN_URL='http://localhost:18000/login'
 LOGO_TRADEMARK_URL=https://edx-cdn.org/v3/default/logo-trademark.svg
diff --git a/src/course-unit/CourseUnit.jsx b/src/course-unit/CourseUnit.jsx
index b532fe0be2..28d3675f0d 100644
--- a/src/course-unit/CourseUnit.jsx
+++ b/src/course-unit/CourseUnit.jsx
@@ -66,9 +66,7 @@ const CourseUnit = ({ courseId }) => {
               />
             )}
             breadcrumbs={(
-              <Breadcrumbs
-                courseId={courseId}
-              />
+              <Breadcrumbs />
             )}
             headerActions={(
               <HeaderNavigations
diff --git a/src/course-unit/CourseUnit.test.jsx b/src/course-unit/CourseUnit.test.jsx
index 2019dfe6f3..01a3199c93 100644
--- a/src/course-unit/CourseUnit.test.jsx
+++ b/src/course-unit/CourseUnit.test.jsx
@@ -5,7 +5,7 @@ import {
 import userEvent from '@testing-library/user-event';
 import { IntlProvider } from '@edx/frontend-platform/i18n';
 import { AppProvider } from '@edx/frontend-platform/react';
-import { getConfig, initializeMockApp } from '@edx/frontend-platform';
+import { initializeMockApp } from '@edx/frontend-platform';
 import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
 
 import {
@@ -28,14 +28,11 @@ import { executeThunk } from '../utils';
 import CourseUnit from './CourseUnit';
 import headerNavigationsMessages from './header-navigations/messages';
 import headerTitleMessages from './header-title/messages';
-import { getUnitPreviewPath, getUnitViewLivePath } from './utils';
 import messages from './add-component/messages';
 
 let axiosMock;
 let store;
 const courseId = '123';
-const sectionId = 'graded_interactions';
-const subsectionId = '19a30717eff543078a5d94ae9d6c18a5';
 const blockId = '567890';
 const unitDisplayName = courseUnitIndexMock.metadata.display_name;
 const mockedUsedNavigate = jest.fn();
@@ -97,20 +94,21 @@ describe('<CourseUnit />', () => {
     const { open } = window;
     window.open = jest.fn();
     const { getByRole } = render(<RootWrapper />);
+    const {
+      draft_preview_link: draftPreviewLink,
+      published_preview_link: publishedPreviewLink,
+    } = courseSectionVerticalMock;
 
     await waitFor(() => {
       const viewLiveButton = getByRole('button', { name: headerNavigationsMessages.viewLiveButton.defaultMessage });
       userEvent.click(viewLiveButton);
       expect(window.open).toHaveBeenCalled();
-      const VIEW_LIVE_LINK = getConfig().LMS_BASE_URL + getUnitViewLivePath(courseId, blockId);
-      expect(window.open).toHaveBeenCalledWith(VIEW_LIVE_LINK, '_blank');
+      expect(window.open).toHaveBeenCalledWith(publishedPreviewLink, '_blank');
 
       const previewButton = getByRole('button', { name: headerNavigationsMessages.previewButton.defaultMessage });
       userEvent.click(previewButton);
       expect(window.open).toHaveBeenCalled();
-      // eslint-disable-next-line max-len
-      const PREVIEW_LINK = getConfig().PREVIEW_BASE_URL + getUnitPreviewPath(courseId, sectionId, subsectionId, blockId);
-      expect(window.open).toHaveBeenCalledWith(PREVIEW_LINK, '_blank');
+      expect(window.open).toHaveBeenCalledWith(draftPreviewLink, '_blank');
     });
 
     window.open = open;
diff --git a/src/course-unit/breadcrumbs/Breadcrumbs.jsx b/src/course-unit/breadcrumbs/Breadcrumbs.jsx
index ff09ce98ea..17e9953644 100644
--- a/src/course-unit/breadcrumbs/Breadcrumbs.jsx
+++ b/src/course-unit/breadcrumbs/Breadcrumbs.jsx
@@ -1,4 +1,3 @@
-import PropTypes from 'prop-types';
 import { useSelector } from 'react-redux';
 import { useIntl } from '@edx/frontend-platform/i18n';
 import { Dropdown, Icon } from '@edx/paragon';
@@ -7,34 +6,14 @@ import {
   ChevronRight as ChevronRightIcon,
 } from '@edx/paragon/icons';
 
-import { useCourseOutline } from '../../course-outline/hooks';
-import { getCourseUnitData } from '../data/selectors';
+import { createCorrectInternalRoute } from '../../utils';
+import { getCourseSectionVertical } from '../data/selectors';
 import messages from './messages';
 
-const Breadcrumbs = ({ courseId }) => {
+const Breadcrumbs = () => {
   const intl = useIntl();
-  const { ancestorInfo } = useSelector(getCourseUnitData);
-  const { sectionsList, isLoading: isLoadingCourseOutline } = useCourseOutline({ courseId });
-  const activeCourseSectionInfo = sectionsList.find((block) => block.id === ancestorInfo?.ancestors[1]?.id);
-
-  const breadcrumbs = {
-    section: {
-      id: ancestorInfo?.ancestors[1]?.id,
-      displayName: ancestorInfo?.ancestors[1]?.displayName,
-      dropdownItems: sectionsList,
-    },
-    subsection: {
-      id: ancestorInfo?.ancestors[0]?.id,
-      displayName: ancestorInfo?.ancestors[0]?.displayName,
-      dropdownItems: activeCourseSectionInfo?.childInfo.children || [],
-    },
-  };
-
-  const getLoadingPlaceholder = () => (
-    <div className="small px-3 py-2" role="status">
-      {intl.formatMessage(messages.loading)}
-    </div>
-  );
+  const { ancestorXblocks } = useSelector(getCourseSectionVertical);
+  const [section, subsection] = ancestorXblocks ?? [];
 
   return (
     <nav className="d-flex align-center mb-2.5">
@@ -42,25 +21,23 @@ const Breadcrumbs = ({ courseId }) => {
         <li className="d-flex">
           <Dropdown>
             <Dropdown.Toggle id="breadcrumbs-dropdown-section" variant="link" className="p-0 text-primary small">
-              <span className="small text-gray-700">{breadcrumbs.section.displayName}</span>
+              <span className="small text-gray-700">{section.title}</span>
               <Icon
                 src={ArrowDropDownIcon}
                 className="text-primary ml-1"
               />
             </Dropdown.Toggle>
             <Dropdown.Menu>
-              {(isLoadingCourseOutline || !breadcrumbs.section.dropdownItems.length)
-                ? getLoadingPlaceholder()
-                : breadcrumbs.section.dropdownItems.map(({ id, studioUrl, displayName }) => (
-                  <Dropdown.Item
-                    key={id}
-                    href={studioUrl}
-                    className="small"
-                    data-testid="breadcrumbs-section-dropdown-item"
-                  >
-                    {displayName}
-                  </Dropdown.Item>
-                ))}
+              {section.children.map(({ url, displayName }) => (
+                <Dropdown.Item
+                  key={url}
+                  href={createCorrectInternalRoute(url)}
+                  className="small"
+                  data-testid="breadcrumbs-section-dropdown-item"
+                >
+                  {displayName}
+                </Dropdown.Item>
+              ))}
             </Dropdown.Menu>
           </Dropdown>
           <Icon
@@ -73,25 +50,23 @@ const Breadcrumbs = ({ courseId }) => {
         <li className="d-flex">
           <Dropdown>
             <Dropdown.Toggle id="breadcrumbs-dropdown-subsection" variant="link" className="p-0 text-primary">
-              <span className="small text-gray-700">{breadcrumbs.subsection.displayName}</span>
+              <span className="small text-gray-700">{subsection.title}</span>
               <Icon
                 src={ArrowDropDownIcon}
                 className="text-primary ml-1"
               />
             </Dropdown.Toggle>
             <Dropdown.Menu>
-              {(isLoadingCourseOutline || !breadcrumbs.subsection.dropdownItems.length)
-                ? getLoadingPlaceholder()
-                : breadcrumbs.subsection.dropdownItems.map(({ id, studioUrl, displayName }) => (
-                  <Dropdown.Item
-                    key={id}
-                    href={studioUrl}
-                    className="small"
-                    data-testid="breadcrumbs-subsection-dropdown-item"
-                  >
-                    {displayName}
-                  </Dropdown.Item>
-                ))}
+              {subsection.children.map(({ url, displayName }) => (
+                <Dropdown.Item
+                  key={url}
+                  href={createCorrectInternalRoute(url)}
+                  className="small"
+                  data-testid="breadcrumbs-subsection-dropdown-item"
+                >
+                  {displayName}
+                </Dropdown.Item>
+              ))}
             </Dropdown.Menu>
           </Dropdown>
         </li>
@@ -100,8 +75,4 @@ const Breadcrumbs = ({ courseId }) => {
   );
 };
 
-Breadcrumbs.propTypes = {
-  courseId: PropTypes.string.isRequired,
-};
-
 export default Breadcrumbs;
diff --git a/src/course-unit/breadcrumbs/Breadcrumbs.scss b/src/course-unit/breadcrumbs/Breadcrumbs.scss
index 6dcf731348..d816b76c90 100644
--- a/src/course-unit/breadcrumbs/Breadcrumbs.scss
+++ b/src/course-unit/breadcrumbs/Breadcrumbs.scss
@@ -1,4 +1,8 @@
 .course-unit {
+  .sub-header {
+    background: transparent;
+  }
+
   .sub-header-title .sub-header-breadcrumbs {
     .dropdown-toggle::after {
       display: none;
diff --git a/src/course-unit/breadcrumbs/Breadcrumbs.test.jsx b/src/course-unit/breadcrumbs/Breadcrumbs.test.jsx
index 3c001ca470..6aecd84632 100644
--- a/src/course-unit/breadcrumbs/Breadcrumbs.test.jsx
+++ b/src/course-unit/breadcrumbs/Breadcrumbs.test.jsx
@@ -6,18 +6,13 @@ import { initializeMockApp } from '@edx/frontend-platform';
 import { AppProvider } from '@edx/frontend-platform/react';
 import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
 
-import { getCourseOutlineIndexApiUrl } from '../../course-outline/data/api';
-import { fetchCourseOutlineIndexQuery } from '../../course-outline/data/thunk';
-import { courseOutlineIndexMock } from '../../course-outline/__mocks__';
 import initializeStore from '../../store';
 import { executeThunk } from '../../utils';
-import { getCourseUnitApiUrl } from '../data/api';
-import { fetchCourseUnitQuery } from '../data/thunk';
-import { courseUnitIndexMock } from '../__mocks__';
+import { getCourseSectionVerticalApiUrl, getCourseUnitApiUrl } from '../data/api';
+import { fetchCourseSectionVerticalData, fetchCourseUnitQuery } from '../data/thunk';
+import { courseSectionVerticalMock, courseUnitIndexMock } from '../__mocks__';
 import Breadcrumbs from './Breadcrumbs';
 
-import messages from './messages';
-
 let axiosMock;
 let store;
 const courseId = '123';
@@ -56,6 +51,10 @@ describe('<Breadcrumbs />', () => {
       .onGet(getCourseUnitApiUrl(courseId))
       .reply(200, courseUnitIndexMock);
     await executeThunk(fetchCourseUnitQuery(courseId), store.dispatch);
+    axiosMock
+      .onGet(getCourseSectionVerticalApiUrl(courseId))
+      .reply(200, courseSectionVerticalMock);
+    await executeThunk(fetchCourseSectionVerticalData(courseId), store.dispatch);
   });
 
   it('render Breadcrumbs component correctly', async () => {
@@ -67,26 +66,7 @@ describe('<Breadcrumbs />', () => {
     });
   });
 
-  it('render dropdown loading placeholder on pending', async () => {
-    const { getByText, queryAllByTestId } = renderComponent();
-
-    await waitFor(() => {
-      expect(getByText(breadcrumbsExpected.section.displayName)).toBeInTheDocument();
-      expect(getByText(breadcrumbsExpected.subsection.displayName)).toBeInTheDocument();
-    });
-
-    const button = getByText(breadcrumbsExpected.section.displayName);
-    userEvent.click(button);
-
-    expect(queryAllByTestId('breadcrumbs-section-dropdown-item')).toHaveLength(0);
-    expect(getByText(messages.loading.defaultMessage)).toBeInTheDocument();
-  });
-
   it('render Breadcrumbs\'s dropdown menus correctly', async () => {
-    axiosMock
-      .onGet(getCourseOutlineIndexApiUrl(courseId))
-      .reply(200, courseOutlineIndexMock);
-    await executeThunk(fetchCourseOutlineIndexQuery(courseId), store.dispatch);
     const { getByText, queryAllByTestId } = renderComponent();
 
     expect(getByText(breadcrumbsExpected.section.displayName)).toBeInTheDocument();
@@ -97,10 +77,10 @@ describe('<Breadcrumbs />', () => {
     const button = getByText(breadcrumbsExpected.section.displayName);
     userEvent.click(button);
     await waitFor(() => {
-      expect(queryAllByTestId('breadcrumbs-section-dropdown-item')).toHaveLength(4);
+      expect(queryAllByTestId('breadcrumbs-section-dropdown-item')).toHaveLength(5);
     });
 
     userEvent.click(getByText(breadcrumbsExpected.subsection.displayName));
-    expect(queryAllByTestId('breadcrumbs-subsection-dropdown-item')).toHaveLength(3);
+    expect(queryAllByTestId('breadcrumbs-subsection-dropdown-item')).toHaveLength(2);
   });
 });
diff --git a/src/course-unit/hooks.jsx b/src/course-unit/hooks.jsx
index 905be41d71..6eafe3fdc0 100644
--- a/src/course-unit/hooks.jsx
+++ b/src/course-unit/hooks.jsx
@@ -1,6 +1,5 @@
-import { useContext, useEffect, useState } from 'react';
+import { useEffect, useState } from 'react';
 import { useDispatch, useSelector } from 'react-redux';
-import { AppContext } from '@edx/frontend-platform/react';
 import { useNavigate } from 'react-router-dom';
 
 import { RequestStatus } from '../data/constants';
@@ -13,21 +12,21 @@ import {
   fetchCourseSectionVerticalData,
 } from './data/thunk';
 import {
+  getCourseSectionVertical,
   getCourseUnitData,
   getLoadingStatus,
   getSavingStatus,
 } from './data/selectors';
 import { updateSavingStatus } from './data/slice';
-import { getUnitViewLivePath, getUnitPreviewPath } from './utils';
 
 // eslint-disable-next-line import/prefer-default-export
 export const useCourseUnit = ({ courseId, blockId }) => {
   const dispatch = useDispatch();
 
-  const { config } = useContext(AppContext);
   const courseUnit = useSelector(getCourseUnitData);
   const savingStatus = useSelector(getSavingStatus);
   const loadingStatus = useSelector(getLoadingStatus);
+  const { draftPreviewLink, publishedPreviewLink } = useSelector(getCourseSectionVertical);
   const navigate = useNavigate();
   const [isTitleEditFormOpen, toggleTitleEditForm] = useState(false);
 
@@ -36,12 +35,10 @@ export const useCourseUnit = ({ courseId, blockId }) => {
 
   const headerNavigationsActions = {
     handleViewLive: () => {
-      window.open(config.LMS_BASE_URL + getUnitViewLivePath(courseId, blockId), '_blank');
+      window.open(publishedPreviewLink, '_blank');
     },
     handlePreview: () => {
-      const subsectionId = courseUnit.ancestorInfo?.ancestors[0]?.id.split('@').pop();
-      const sectionId = courseUnit.ancestorInfo?.ancestors[1]?.id.split('@').pop();
-      window.open(config.PREVIEW_BASE_URL + getUnitPreviewPath(courseId, sectionId, subsectionId, blockId), '_blank');
+      window.open(draftPreviewLink, '_blank');
     },
   };
 
diff --git a/src/course-unit/utils.jsx b/src/course-unit/utils.jsx
deleted file mode 100644
index 5bd8b7a376..0000000000
--- a/src/course-unit/utils.jsx
+++ /dev/null
@@ -1,23 +0,0 @@
-/* eslint-disable max-len */
-// @ts-check
-
-/**
- * Method to return course unit view live URL path.
- * @param {string} courseId
- * @param {string} blockId
- * @returns {string} {`/courses/${string}/jump_to/${string}`}
- */
-export const getUnitViewLivePath = (courseId, blockId) => (
-  `/courses/${courseId}/jump_to/${blockId}`
-);
-
-/**
- * Method to return course unit preview URL path.
- * @param {string} courseId
- * @param {string} sectionId
- * @param {string} blockId
- * @returns {string} {`/courses/${courseId}/courseware/interactive_demonstrations/${sectionId}/1?activate_block_id=${blockId}`}
- */
-export const getUnitPreviewPath = (courseId, sectionId, subsectionId, blockId) => (
-  `/courses/${courseId}/courseware/${sectionId}/${subsectionId}/1?activate_block_id=${blockId}`
-);
diff --git a/src/index.jsx b/src/index.jsx
index a309fa1e46..39c682cb66 100755
--- a/src/index.jsx
+++ b/src/index.jsx
@@ -104,7 +104,6 @@ initialize({
         SUPPORT_URL: process.env.SUPPORT_URL || null,
         SUPPORT_EMAIL: process.env.SUPPORT_EMAIL || null,
         LEARNING_BASE_URL: process.env.LEARNING_BASE_URL,
-        PREVIEW_BASE_URL: process.env.PREVIEW_BASE_URL,
         EXAMS_BASE_URL: process.env.EXAMS_BASE_URL || null,
         CALCULATOR_HELP_URL: process.env.CALCULATOR_HELP_URL || null,
         ENABLE_PROGRESS_GRAPH_SETTINGS: process.env.ENABLE_PROGRESS_GRAPH_SETTINGS || 'false',
diff --git a/src/setupTest.js b/src/setupTest.js
index ef139dcbfb..b4feef6c1f 100755
--- a/src/setupTest.js
+++ b/src/setupTest.js
@@ -46,7 +46,6 @@ mergeConfig({
   CALCULATOR_HELP_URL: process.env.CALCULATOR_HELP_URL || null,
   ENABLE_PROGRESS_GRAPH_SETTINGS: process.env.ENABLE_PROGRESS_GRAPH_SETTINGS || 'false',
   ENABLE_TEAM_TYPE_SETTING: process.env.ENABLE_TEAM_TYPE_SETTING === 'true',
-  PREVIEW_BASE_URL: process.env.PREVIEW_BASE_URL || '',
 }, 'CourseAuthoringConfig');
 
 // Mock the plugins repo so jest will stop complaining about ES6 syntax