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Half screen/whole screen change on Firefox

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My friend changed my whole screen view on Firefox to half screen. How do I change back to whole screen?

My friend changed my whole screen view on Firefox to half screen. How do I change back to whole screen?

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Simply open the toolbar popup UI and click on the desired layout set (size & position). Once you click a layout, the window will be positioned and resized to the chosen layout.

Regards, Will