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How to reset the size of the window back to smaller (Currenly whole sceen)

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Yesterday I tested to use Firefox on a whole screen mode. I installed an icon to a nav menu "whole screen". I can only get the screen bigger. How can I reset the size back to smaller. I have a 27" screen.

Yesterday I tested to use Firefox on a whole screen mode. I installed an icon to a nav menu "whole screen". I can only get the screen bigger. How can I reset the size back to smaller. I have a 27" screen.

All Replies (3)

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Do you mean full screen?

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Yes sorry I mean full screen !!! Do I need to remoeve the icon Full screen from the nav bar to be able to get back the smaller window? At the moment Firefox fill out the whole 27" screen.

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Click on the fullscreen button once again. I don't whether that works cause I don't have a mac.