GL-AR750S-414 won't connect in extender mode

I have a GL-AR750S-414. It works fine as a repeater, but when I try to change the network mode to extender, I can’t connect any devices to it. Neither my laptop or my android phone. Is there something else I should change before setting extender mode?

There is nothing more to set for extender.

When set up as extender, does it connect to main wifi successfully? If yes you can find its IP address in your main wifi network?