From the Devices tab, you can see the names of all devices connected to your network, together with those in groups. You can also scroll down to see any that are off-line (devices previously connected to your network).
Tapping on any of the devices shown, will open a Device Information menu where you can update access controls (add or remove from a group, rename or block a device). You'll need the Admin password to make changes
In addition, the Home screen gives you visibility of how your Whole Home Wi-Fi network is connected, with each disc showing the number of devices currently connected to it. For example, "x" devices connected. Tap on the disc and then press See Connected Devices, to show any devices connected to that disc. Tapping on any of the devices shown, will open Device Information. This is where you can update access controls (add or remove from a group, rename or block a device). The Admin password is needed to make changes.