Moving mouse on windows’ edges there is no resize option. Also if a window is dragged out and maximized, it can’t be restored to its original size by clicking the top-right square again. Unity 2018.3.0b3, Fedora 29.
I’ve observed the same issue on 2018.3.0b3 on AntergOS (Arch-based) using Cinnamon DE.
I have same problem with 2018.2.7f1 (Linux Mint). I actually upgraded to this version hoping it would be solved. As a ‘bonus’ problem when I drag a window it jitters like crazy.
This sadly is a known issue atm Unity Issue Tracker - [Linux Editor] Undocked panels can't be resized in some Desktop Environments
We have it on our list to fix.
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