Doesn't Archicad have 'combine by material' option when exporting to external file formats like fbx\obj? If you by mistake have 3ds Max- there are some soog solutions..

nothing of that sort exists.

in windows, you may be able to hide the title bar of the palettes.

Anton S window setting was able at this - really great plugin - you may want to try
https://sketchucation.com/pluginstore?pln=ams_WindowSettings

i used to do it years ago in win 7, you may need to do a google search. you can also look for autohotkey scripts that will do that. autohotkey can work with specific windows classes so you can affects only the desired palettes and not the main window.

lastly, all of this stuff i used to do it before the 'tray'. no idea how that all works now.