AP Isolation EX5401-B0

On all of the other zyxel routers & everyone I have owned there was AP isolation per SSID.
On EX5401-B0 I do not see it and there is only a panel to add additional SSID on the guest tab where one can make subnets-which is very good addition---but on these subnets where is the option for AP isolation.
I use the router with MESH turned off.
Thank you in advance!

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