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(Built from commit 48de201)

Code looks good!

I have two thoughts:

1. I think the "style" tab is becoming a random mash of settings now. I think we should probably pull these new settings and the existing "Project Colors" list out into a new dedicated "Colors" tab.
2. Do you think we should add a button to export the current profile to a file on disk? If eg a user shares a project with someone else, they may want to easily extract this profile to use for another project or in another application.

I have two thoughts:

Good points. Done. Screenshot has been updated

@troopa81

This pull request has been tagged for the changelog.

• The description will be harvested so please provide a "nearly-ready" text for the final changelog
• If possible, add a nice illustration of the feature. Only the first one in the description will be harvested (GIF accepted as well)
• If you can, it's better to give credits to your sponsor, see below for different formats.

You can edit the description.

Thank you!

@troopa81
This pull request has been tagged as requiring documentation.

A documentation ticket will be opened at https://github.com/qgis/QGIS-Documentation when this PR is merged.

Please update the description (not the comments) with helpful description and screenshot to help the work from documentors.
Also, any commit having [needs-doc] or [Needs Documentation] in will see its message pushed to the issue, so please be as verbose as you can.

Thank you!

@troopa81
A documentation ticket has been opened at qgis/QGIS-Documentation#9289
It is your responsibility to visit this ticket and add as much detail as possible for the documentation team to correctly document this change.
Thank you!