iTunes - Always play your videos in fullscreen mode

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You can configure iTunes to automatically switch to full-screen mode upon playing a video.
  • Click on the Edit menu > Preferences> Playback tab
  • Next to "Play films and TV programes", click on the drop-down menu and select "full screen"
    • You can also apply these settings for the "Play music videos" option
  • Click on the OK button to validate your choice.

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