The pop up menu to choose which rule set to edit does not show correctly. I’m running SheetCAM in Wine. There are no problems with pop-up menus in general. It’s just this one.
What version of Linux are you using? I just tested it with Debian 10 and that dialog looks correct.
It’s MacOS with CrossOver/Wine.
I just had to resize the dialogue window to give space to the pop-up 
Sorry.
I’m glad you figured it out. Mac + crossover isn’t a configuration I ma set up to test here.