Allow the fields sidebar to be 'sticky' and not scroll with main panel

[Oshyan]

I’m in support of some version of this, maybe just independent scrolling for each sub-panel. Also a similar/related idea:

"Sticky" pinned fields header (or sidebar) in Entity View

As I begin to work with longer Entities in Fibery (think of meeting notes as a relatable example), I am finding a notable desire to have “Sticky” or “Fixed” fields in the Entity View. The obvious way to implement this would be just make the new Pinned Fields area into a Sticky Header, just like the common website sticky headers, or indeed the sticky Entity controls and title already in Fibery! Except it’d be another line just below that. Sure, it’d take up a little bit of room, but really very l…