You can view the version history of a page by clicking on the timestamp below the page title:

Alternatively, you can click on the dropdown menu and select "View version history":

Reverting to a Previous Revision

To revert to a previous revision, first select the desired revision in the left sidebar. Next, click the "Revert to this version" button near the top of the page:

Highlighted Text

Content highlighted in red means it was removed in this version. Text highlighted in green means it was added. 

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