You are trying to adjust everything in full screen, but you are still running in windowed mode, you have me confused. What seems to be the issue that needs fixing? Getting it to full screen? There may be a check box somewhere in options, sometimes pressing "alt + enter" can switch between windowed and full screen modes. Also while googling it for a second it seems remote control and/or vnc software like teamviewer can cause issues, kill the process if there is one.
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