Restrict Meetings To Office Working Hours
Ensure meetings are only booked during your office’s working hours for better scheduling control.
Enabling this rule will block users from booking meetings outside the set office working hours for the office.
Office working hours are also used when showing the day view of meeting rooms.
Each office can have its own office hours or you can set hours at a global level for all offices.
If you have integrated rooms with Microsoft or Google this rule may get bypassed by booking in Outlook or Google Calendar unless you enable the "External Calendar" rule.