Laptops on the wifi network can't see computers on the LAN
I have a fibre connection to the internet, and two Deco X20 devices. Everything is working well - devices using wifi connect to the internet. Two PCs are connected to the modem by ethernet cable - they are on the LAN. Machines on the wifi network cannot see machines on the LAN, and vice versa. Network discovery is turned on on all these machines. I want to be able to transfer files between laptop and PC, and also I want the laptops to use the network printer. How can I connect the wifi network to the LAN?