@Alexandre. Problem solved, your suggestion has worked and now WLAN is same subnet as wired LAN so no longer routing issues... Thanks very much Alexandre!

@Alexandre. Thank you! That looks like a good option.

From Deco WAN I want to be able to access wired LAN devices (printer, SAN, etc). Is it possible to add static routes to Deco or are there other tricks for doing this? WAN network is 192.168.68.1/22...