TLDR
Enter a command. For example: pio init, electron packager.

xkill

 
Kill a window interactively in a graphical session. See also kill and killall. More information: https://www.x.org/releases/current/doc/man/man1/xkill.1.xhtml.
 
  • Display a cursor to kill a window when pressing the left mouse button (press any other mouse button to cancel):
     
    xkill
     
  • Display a cursor to select a window to kill by pressing any mouse button:
     
    xkill -button any

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