UI doesn't use full window space in popups
Version of the app: 25.1.0
Platform and OS version: MacBook Pro 2021 running 15.0
Basic steps to reproduce the problem
When a popup window appears, the UI only uses a small space rather than filling the whole window, which makes it challenging to navigate/use, especially on a smaller monitor. When dragging the corners of the window to resize, the UI only resizes within the small space and doesn't expand.
Expected result and actual result
The UI should load dynamically utilising the whole size of the window and respond to resizing correctly, but it currently fills around a quarter of the window.

