does anyone have an idea how I close the window of this application
Hi and welcome to the forum,
Click the Quit button. If it doesn’t work, you can use F4 or Ctrl+Q. If none of this is working, you can force quit any application from the Task Manager on Windows.
I have an Mac computer
Option+Command+Esc should open the “Force Quit Applications” window, and select the one you want from the list.
thank you very much you helped me a lot