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See the attached video on how to do this.

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Window can’t be resized: use Tab

Some windows, however cannot be rezied, as an example Global Settings. If this is the case and you cannot see a way how to close the window, the following tip can be used: use Tab button. Each click will move the cursor to next field on the screen again and again, until the Cancel or OK button are in focus. Then you can close the window.