AR750 mode switch button

hi
What’s its use button mode switch ?
it must be left or right ?
thanks for your response.

If you haven’t set it up yet, it’s a “No-Op” (does nothing).

It can be used to switch between modes, or VPN on/off if you set it up in the GUI.

thanks you i have used this button for enable or disable openvpn.

What GUI? Where in the GUI?