Mesh Network Set-up
Setting up a Mesh Network is easy if you follow the instructions. Set the additional AP where you need the extra coverage, but make sure it can still connect to the central router. Once done, use the control application in the Devices menu, go to Add a new Device, and select the "How to extend my network" button and click on "extend over-the-air." You will be asked to power on the new device without connecting an Ethernet cable.
I finished the process in the mobile application. Once the scan is done and device found, add it to your mesh network. You can set a device name and take a look at the mesh network's topology.