The Acquisitions module can be hidden in the staff interface by using IntranetUserJS, but just like the following modules/features can be enabled/disabled or set to use/don't use, it would be nice to have this functionality in system preferences to turn on/off the Acquisitions module as well. Existing features set in system preferences: ERMModule (Enable/Disable) CurbsidePickup (Enable/Disable) ILLModule (Enable/Disable) UseCourseReserves (Use/Don’t Use) EnablePointOfSale (Enable/Disable)
Permissions also work to hide the module, but we also had questions about disabling it in the past and I guess if your users have superlibrarian a switch would be nice.