How to connect to hidden wireless

hi,
I am a new user of NomadBSD which is installed on USB stick ( NomadBSD 141R-20240711).
I wanted to access to a hidden wifi, but the network manager of nomadBSD did not allow to add hidden ssid. I did some setting on wpa_supplicant.conf (by adding option scan_ssid=1, etc…), but it is not work even after reading freebsd web site. My wifi access point uses WPA2-PSK

Do you know how to allow a connection to hidden ssid using network manager ?
I mean , I did not find any drop list to add hidden SSID.
Is it possible to add hidden ssid on nomadBSD ?