Hi @Syz-
I do not see an Automatic Method of disabling to all clients to specific SSID. May be by device type you can apply Block Policy automatically.
One Idea could be filter the clients on the basis of SSID.
Select All Clients
Apply Block Policy
All these options are available in
Network Wide>Monitor>Clients
Just for information
Why do you want to block all the clients?
You may simply Hide or Disable the SSID too.
Regards,
Ajit
AjitsNW@gmail.com
www.ajit.network