Step 1. Click on Apple icon at menu bar.
Step 2. Choose Force Quit Finder.
Step 3. You will see a pop-up window that shows all the running apps on Mac.
Step 4. Select the name of the app or icon you want to quit.
Step 5. Click on "Force Quit" button.
Step 6. The Mac will ask you again if you want to quit the application, and then click on "Force Quit" again to confirm.