Your devices using Logitech Options are displayed in the Logitech Options interface as shown:

If your device does not appear, check the following:

• Your device could be OFF or the battery has been completely drained. Please turn on your device and make sure that the battery has sufficient charge. See Mouse battery status indicators for more information on checking your battery status.  
• You may have an older version of Logitech Options installed. You can get the latest version from logitech.com/options.