Nevertheless i have been required to use one of the following options quite a few times to perform the kill/force quit action using one of the two options presented below:
- Force Quit Applications application π It will let you highlight the application and press Force Quit:

You get access to the Force Quit Application app via e.g: - The activity monitor where you highlight the Process name β click the Stop button to the top left

and then press Force Quit

You can access the Activity Monitor via e.g.:
The above should work in most macOS releases but has been tested on macOS Catalina version 10.15.6
Enjoy Force Quitting Apps π



