In version 11.21.1, Episerver introduced an upgraded UI. The working of the top bar is a bit different, the editor is cleaner, and the colour of the top bar changes to blue. Most things stay as they were.
Having gotten used to the orange, I found the blue too dark, and too harsh against the cleaner editor.
This package brings back orange and the old active item highlight.
To use, install the package in your project.