Missing documentation?

I am a newcomer to GL.iNet please be specific in your replies I do not know all the ACRONYMS, yet.
I have a GL-AX1800 and I have been trying add a Wi-Fi printer, an Epson Workforce WF-2650, each time I try to add using the Epson Wi-Fi Setup I get an error report which says there is an Access point channel conflict detected. I think there might be a clash between the channel used by my ISP's hub for 2.4gHz.
My setup is to attach the GL-AX1800 to my ISP's hub as a LAN connection to the AX1800 WAN port. I have had advice that I need the AX1800 in a mode that seems to be called Repeater.
I cannot find any reference to this 'switching modes' in the docs. Is there something missing?

It is network mode in setting GL UI web

Do you mean the items Access Point, Extender, WDS on the Network Mode.
Which of these controls 'Repeater'?

Oh sorry, I thought Extender.

About repeater should be main page


If you don't have that like screenshot that's mean your router does not support repeater.
Anyway, I found document and there has two different versions Flint

I think maybe not. Since you mentioned that you connect the AX1800 to your ISP's hub via Cable.
You can go to Wireless menu and find the 2.4G wifi, then change another channel to take a try, better to choose 1, 6 or 11 to reduce interference.
And please share a picture about the error report if still this issue.

Thanks for the response. I obviously pushed a button somewhere I shouldn't have. When I try to change the channel in the place you indicate it tells me that I cannot change that while it is in the 'repeater' mode.

I think I will try and start again by resetting the factory mode and go through the tutorial I have found.