Lenovo Photo Master doesn't appear to be an active application. It was pre-loaded on the Lenovo laptops and that's it. No further downloads or troubleshooting is available anymore. If you have the software, then access its Settings menu along with the Help documentation. You'll find all the functions describe in the Help menu. You'll have the possibility of changing WiFi connections from the Settings menu. Simply delete the network it's connected to and the software won't connect anymore.
