Cant Close Windows, app already quit

I am running a 2019 macbook pro with GIMP 2.10 installed

For some reason, gimp's windows will stay open, even after the app is quit

how can I close these windows?

Solution 1:

I face similar problem with octave-GUI.

I run

killall -9 octave 
killall -9 octave-gui

twice to get rid of that.

So you can run

killall -9 GIMP

Make sure you're using case sensitive name of the app.