Full width drag&move area in app window

Hello,
man times it happened that I wanted to drag/move the app window by click&move on the area above the details. But nothing happened.
The only area for dragging/moving the window is above the list of items. I use BW for MacOS (no idea how it works with Windows).

My “wish”:
Adding area at the top of the app window (full width) for drag&move.