Navigate to the app’s Menu > Settings and tap Trusted Networks. On the Trusted Networks screen, tap Enable the Trusted Networks feature in VPN Unlimited app and add the desired networks.
After this, the chosen network appears in the Trusted Networks list. To remove it, just tap X.
Note: On Android 9 and higher, in order to use the Trusted Networks feature, please allow our app to access your location. This permission is required to detect the WiFi network you are connected to only.