Hide/Delete Groups Folder in Outlook
Will you solve this in future? https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook/hidedelete-groups-folder-in-outlook/725fc11a-841f-4702-9815-886ad8432aae
It's great that Microsoft wants to add new features to Outlook, and I'm sure many will get a lot of use out of Groups, but as a rule any new feature that impacts a display (such as the folder pane) should be able to be disabled, or at a minimum, hidden.
Please, if you giv the users new feature, giv them choice to use or not.