Gambas has a problem on some systems if your desktop font size is too small.
Go to your system Appearance settings and change the default "Application Font" to something more than 10.
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I have found the mark is 10 , at Application font size 10 some systems have a problem, at 11 all is okay , Mint is okay and so is ubuntu on size 10, issues on most other systems though.
wait hang on , you're using Mint?? So not sure why you're getting the problem then, it's fine on mine, even at size 10??
I have reported this bug a while ago and Benoit is trying to fix it (the reason for Desktop.Scale being recently added to System info page)
http://gambaswiki.org/bugtracker/edit?o ... m=L21haW4-
So up your desktop font size to 11 (desktop settings not gambas settings) and it should fix it
Hmm, unless you have a different problem , like i say font setting all working fine on my latest gambas (mint 20).