Microsoft Bookings new feature: user-level controls
Microsoft Bookings user-level controls is a new Office 365 feature for Office 365 Business Premium subscriptions. So that means, if you have an Office 365 Business Premium subscription, you get admin level controls to grant/restrict Bookings access at the user level. You can turn Microsoft Bookings off for the whole organization or just restrict certain users from getting access to Microsoft Bookings.
If you’re interested in additional information, check out this Microsoft article on Bookings.