Once the schedule DWH report throws an error while editing, it can't be fixed. You would need to set up another schedule by duplicating it.  

Creating a product profile within Admin Console for Analytics solution will help. These product profile is replacement of user group in the user management.

This looks to be an issue and would request you to raise a ticket with Client Care

With the recent changes in June MR, Recipients added to the “Can edit” role can save over a project that has been shared to them and function as co-owners. This enables better project collaboration with members of your team. Ref Doc: https://docs.adobe.com/content/help/en/analytics/analyze/analysis-...

You can use Marketing channel processing rules for setting Marketing Channel Reports for mobile app based report suites. These reports are independent of Ptaform ( App or website) and are run based on marketing channel processing rules configured within Report Suite Manager ( Admin> Report Suite> Ed...

Once the project is saved after making changes, it can't be rolled back. Since you have clicked on cross button before saving. It will lead to deletion of panel.