It's on each P25 system.View attachment 174984
There is a note in the help section that says:
Each trunking system can set different SUID, this feature is only for G5N Model. If you are using old Gx model, you can set the SUID on "Conventional Group ID Setting / Pager ID Setting" page.
I don't know what a G5N model is (I have a G5, never heard of a G5N), but it's probably a good idea to adjust the SUID in the other location it mentions (screen E6, click on the "Pager ID Setting" tab) also. You have the same options there--setting an ID or unchecking the "Enable" box.
I expect it would be enough to simply uncheck the "Enable" box, but to be on the safe side I set all of my SUIDs to something other than "1" before disabling. If any of you system admins wants to experiment and let us know if unchecking the box is enough to cause the pager to ignore inhibit commands, please do