I try shortcut to delete column (ctrl+delete), move to prev/next column (ctrl+up/down), and they are not working too.
Btw I install StarUML v3 by adding `chmod +x` to .AppImage file, execute it using terminal, when StarUML opened, I lock it to launcher, then I close StarUML,
and finally modify .desktop file, change `Exec` key to (absolute path) of .AppImage file instead of .tmp path (generated by terminal session).
Is there something missing/wrong with my installation?
Thanks.