Revert the 'Planned Maintenance' [sp_widget] to the out-of-box (OOB) version

1. Go to the Planned Maintenance Portal page
2. Click Ctrl + Right-click on the page and it will give you a list of options
3. Choose Instance in Page Editor and check the Widget if it is a customised version of the widget
4. Modify the UI page to use the out-of-box (OOB) widget 'Planned Maintenance' by choosing in the widget dropdown and Save
5. If you have not added a custom version and have modified the out-of-box (OOB) version, you need to go to the platform or advanced view.
6. In the navigation bar, type in sp_widget.list to go to the list of Service Portal widget records.
7. Filter in the Name or the sys_id of the widget 'Planned Maintenance'
8. In the Versions related list, select both Custom (current) and Upgrade version
9. Click on Action on selected rows > Compare > Revert to Selected version which is the OOB version
10. Save.