Education (EDC): Troubleshooting Cancel button on the Action Plan FlexCard 'EDUStuSuccessActionPlanListContainer' not working

This issue is caused by the Release Update, 'Keep Working with Tab-Focused Dialogs' (please right-click the link and open in a new tab to see the release notes) being enabled in your org.

The 'Keep Working with Tab-Focused Dialogs' Release Update has been postponed indefinitely and there are no plans to reinstate the Release Update or redesign this feature at the present time.

If an Org has this Release Update enabled it is recommended that it be deactivated to provide a more stable experience within your Org.

The reasoning for this indefinite postponement is that this feature has been known to cause a number of stability issues when the feature is in use.  Unfortunately due to the number of destabilizing issues that have been found, a decision was made to push for the deactivation and removal of the feature.  

Deactivating this Release Update will allow the 'Cancel' button in the Action Plan FlexCard 'EDUStuSuccessActionPlanListContainer' to work correctly.

You can deactivate this Release Update by following these steps:

1. Click on the gear in the upper right corner and select Setup.
2. In the 'quick find' search box on the left side of your screen search for and select 'Release Updates'.
3. Click on the 'Archived' tab and look for the 'Keep Working with Tab-Focused Dialogs' update. 
4. Click the 'View Update' button and you should see an option to deactivate the release