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I am assuming that you require to undo some changes that you made in your form. Please following the following to revert the changes
1. Go to My Forms page and select the form you want to view its revisions.
2. Click "More" button
3. Find and Click "Revision History" option
4. On the left side, you will see a list of revisions for your form.
Browse versions and review form changes by clicking on a version on the left side. The middle frame shows a preview of your form and the right side has a list of changes you have done on that version. Click "Revert to this Version" to bring back the old changes.
Please let us now if this helps