How to open the options menu without using the mouse in windowed mode?

How to open the options menu without using the mouse in windowed mode? - Crop pupil using mouse of laptop in classroom

I put my game on window mode instead of full-screen. Now I cannot reach the options menu any more by mouse (it is too far down) nor can I regain full screen. Is there any shortcut key combination to open the options menu or any way to change that in the settings?

Thanks a lot!

league-of-legends

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How to open the options menu without using the mouse in windowed mode? - Crop anonymous schoolkid against open netbook with information on screen studying at table in classroom

How to open the options menu without using the mouse in windowed mode? - Faceless pupils using mouses of laptops during lesson in school

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