This is a feature available to Chalk Gold subscribers and teachers whose schools are subscribed to the Instruction Solution.
Use the Lesson History feature to recover or restore your lesson to a previous state. Lesson History displays the last 250 edits made to the lesson over the previous five days.
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In the lesson editor, select Options, then choose Lesson History.
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On the Lesson History page, click on the edits to display the lesson content.
Use Lesson History to:-
Search the lesson version history.
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Review deleted lessons for the current date.
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Review recent edits to the lesson.
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Compare edits to the current version.
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Select the version of the lesson you would like to restore, then click Restore to replace the current version with the selected version.