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Undo / Redo
Step back or forward through your changes. Ctrl/Cmd+Z and Ctrl/Cmd+Shift+Z work too.
The two arrows at the top left undo and redo your latest changes. From the keyboard: Ctrl+Z (Cmd+Z on a Mac) to undo, Ctrl+Shift+Z (Cmd+Shift+Z) to redo.

Undoing changes the editor, not the page: for your public page to go back you need to press «Save».
Still stuck?
Terms and definitions live in the glossary; for anything else there’s support.