Currently a single color can be selected in Settings for an application/tenant, this selection applies to the top pane of the screen, text background, login page and some additional locations.
A request is raised to allow additional UI elements to be colored and the flexibility to select a few colors and apply to the different UI elements (top pane, left pane, login page, text highlights and a more).
This is currently being assessed so it doesn't raise complexity and doesn't negatively affect text-background color contrast.
(Internal use: 10701)