I just got a Shelly 1 Plus to try out, and I cannot seem to get it to change the relay type to anything other than toggle.
My setup is just a simple bench test at the moment: Line connected to L, I, and one pole of a switch. Other pole goes to SW. O connected to a light. Other leg of light and N both tied to neutral.
If I change the relay type to "Edge" or "Detached" and hit save, there is no change in behavior - turning the physical switch on turns the output on and turning it off turns the output off.
If I reboot the unit, and go back in to the setting it is back to "Toggle", so it seems like the change is just not sticking. I'm on the latest firmware.
Am I missing a setting somewhere?