Bridge 2020 Catalina Window/Pane doesn't stretch over more than one screen

as the subject says...

when I move the Bridge window over to a second screen it only shows up where most of the 'window estate' is visible, but doesn't stretch over.

(is was and why should this be possible:

I need to push the window a way a little to work on was underneath but still need the bridge window viewable (without having to resize window or pushing it all the way to a another screen

another scenario: I want the preview window really big, but still want to see all thumbnails and files panes as before)

(mac pro 2020, Bridge 2020, three LG Ultra Fine Screens, Catalina MacOS 10.15. 2all worked with mac pro 2013 MacOS0.14.)