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In V16, customers are calling and thinking they no longer have admin access. They are clicking on Domain Reports and Domain Settings and feel like it is a dead end.
Once we remind them to open the side panel, they love us and think we can walk on water like Jesus did.
Bottom line: Throughout the surfing experience, I think it would be best to keep the side panel open if opened by the user. Keep it closed if closed by the user. Default should be open.