After connecting to a video beamer screen changed format

I connected the mac book to a video beamer and the screen turned sort of to a wide screen. like when i open a new window it is wider than the screen. stayed that way after disconnecting the beamer. I can't find any place to change that back.

You are reading the instructions for a Windows PC. MacBooks automatically have the video port turned on. As soon as you plug the projector in you should see output. Then in System Preferences - Displays - Arrangement you have the option to mirror or extend the desktop.

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