uc-unified-extensions.css

#unified-extensions-view {
  width: 31em !important;
}

#unified-extensions-panel .unified-extensions-item {
  margin-block: 0 !important;
}

.unified-extensions-item-menu-button.subviewbutton {
  min-height: 100% !important;
  padding-block: 0 !important;
}

.unified-extensions-item[attention] > .unified-extensions-item-action-button.subviewbutton {
  background-image: url(chrome://userchrome/content/indicator-tab-attention-purple.svg) !important;
  background-size: 11px !important;
  background-repeat: no-repeat !important;
  background-position: center left calc(var(--uei-icon-size) + 6px) !important;
}