Reservations -> Background Data -> Define Room Arrangements

• Choose a room arrangement
• Set the "Maximum Capacity" and "Minimum Required" values to something high for testing such as 99 for Maximum Capacity and 30 for Minimum Required.
• Now go to Workplace to Book a Meeting Space.
• Go to the floor plan of the room arrangement that was modified.
• Depending on the other rooms on the floor, the room may not be highlighted blue. The Seats filter will likely have increased to a maximum of 99 seats. The slider would need to be moved to 30 for the room to be highlighted. So the "Minimum Required" value works for the filter.
• Select the room and then press Book to advance.
• Select any available meeting time then press Next.
• For Meeting Info, enter any name.
• On the left side of the screen, it will show the minimum and maximum range, in our example, 30-99. From here, the user is able to advance and complete the booking even though no attendees have been added. The user shouldn't be able to advance past this screen unless a minimum of 30 attendees are added. The setting seems a bit misleading because it makes it seem as though it applies to the reservation and not just the filter. This functionality would be useful to prevent people from reserving rooms that have more seats than they need.

https://www.archibus.net/ai/abizfiles/v25.2_help/archibus_help/user_en/archibus.htm#../Subsystems/webc/Content/fim/res/rooms/def_rm_arrange.htm