Allow users to add and remove their own sites during startup when the RestoreOnStartupURLs policy is configured.

This policy only works if you set the 'RestoreOnStartup' (Action to take on Microsoft Edge startup) policy to 'Open a list of URLs' (4) and the RestoreOnStartupURLs policy as mandatory. If you enable this policy, users are allowed to add and remove their own URLs to open when starting Microsoft Edge while maintaining the admin specified mandatory list of sites specified by setting 'RestoreOnStartup' policy to open a list of URLS and providing the list of sites in the RestoreOnStartupURLs policy. If you disable or don't configure this policy, there's no change to how the 'RestoreOnStartup' and RestoreOnStartupURLs policies work.