How to dock side panels

I think i messed up by hitting some shortcut. Side panels are now detached from window wasting space and giving me headache when something is moving in that thin gap. Also left ruler is unusable.

What did I do? How can i return it back? Thank you :slight_smile:

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It seems like you just got the new Figma UI - the new UI actually have a gap between window frame and side panels.