How to make workstation wifi only show permitted SSID

Hi All
I build ZCM 11.2.3 server and want to control all workstation only access internal WIFI SSID, want to block all SSID include smartphone. but I always could not know how much SSID in HQ and branch office.
How could I modify ZESM policy clock all unpermitted SSID ??

thanks!!

wyld