With 6.10 LTS -- I keep getting these left ... only way to get rid of them is to close purebasic's IDE and restart.
I've had this a dozen times today...
(FWIW: I didn't select any of them... and I thentyped "why???" as seen at the bottom. I can close the file/tab, it stays put. If I minimize the IDE, when I restore it; it remains)