Yes, this setting is possible with AMGuard Standard Edition, Now you can stop users from changing their WiFi settings on the device. Below is the path to enable this setting.
Path: Policies > Actions > Edit > Networking > WiFi Config Lockdown Enabled
You can turn on/off this setting anytime as per your preference. Once you have this setting turned on the user will no longer be able to change WiFi settings on their devices.
Below is the illustration of the setting
