Window with Header Bar - Always Backgrounded?

I've been working with rearranging panels and windows in my custom workspace. I find the behaviour of the window with the header bar very frustrating.

This window always remains in the back - there is no way to foreground it. It does not move to the foreground as one expects when one selects / activates a window. In fact, there appears to be no way to move this window to the foreground. The only way to access it is to minimize  / resize other windows.

This behaviour is particularly frustrating because the export window / dialog / options are only accessible in this window, and yet it is always underneath other windows with no way to call it forward (the old export dialog was foregrounded, naturally, when you selected the export function).

I am trying to fathom the design intention behind this. Any insight appreciated.

(I've written about other irregularities in the way Premiere Pro windows behave on a mac here and here.)

Video demonstration added below.

R.