How do I hide unused columns in the Calendar?

To hide the unused columns in the Calendar, click on the Calendar menu and then tick the Hide empty columns box.

Any columns that are not included in the Availablity for the currently selected Personnel or Location(s) will be hidden when you view the Calendar, UNLESS they contain Appointments or Events.

Because it is possible to create appointments and events that are not necessarily on normal work-days, the Calendar will show those extra days as needed.

The setting is saved for the current User, and remains in effect until you turn it off, by clicking on the Calendar menu and then unticking the Hide empty columns box.