WordPress fullscreen bug

Hey, i create a Website right now. It used to bei in fullscreen, then i got to ‘Apearence Settings’ and i played with the settings, when i insert a picture for the background and deleted it right after, the whole format were different. I cant undo it on the same Settings or even on the ‘Customizer’ Settings.

The picture in the middle used to fit into the screen. I marked the missing parts red besides the picture. Also i put the settings on the left.

Thank you guys for the potential help or the effort!

 

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