If you used to use Wi-Fi (wireless LAN) but no longer need to do so due to a change in connection mode and so on, you can disable your Wi-Fi connection.
By removing unnecessary Wi-Fi signals, you can also reduce the load on your standby power.
Tap 
on the printer's home screen.
Select Wi-Fi (Recommended).
Select Change Settings.
Select Others.
Select Disable Wi-Fi.
Follow the on-screen instructions.