Apple - macOS app icon stuck on my screen

Turns out, I just had to reset the 'dock' process. I opened Terminal and typed

killall Dock

and pressed enter. The screen flashed for a second, and everything came back with my stuck icon gone.

If that fails, the issue may be with Finder (this is the case with the similar issue of Stacks categories "burned in" to your desktop background). Running

killall Finder

will address that.

The easiest fix is to just open the app drawer, holding any icon until the move motion occurs, then move any application; it seems to fix it everytime it happens for me.

What I do is pressing CTRL+OPTION+ESC then relaunch Finder app. Works for me.