Sticky Header in Control Panel

[deeekay]

In Craft 4 (if I remember correctly), it was possible to have the header in a sticky position allowing to quickly switch from one site to another which was especially useful for longer pages where scrolling was necessary. This functionality is not present in Craft 5 anymore. It would be nice to have it - even as a user preference of sorts.

Thanks for taking it into consideration.

[thupsi]

Related: #18117