TeamViewer Incoming Connections

Enable Two-Factor Authentication for your TeamViewer account.

Make sure you disable the following features for incoming connections:

• Transfer Files: Denied
• Establish a VPN connection: Denied 
• Lock the local keyboard and mouse: Denied
• Control the local TeamViewer: Denied
• File transfer using the file box: Denied
• Print on remote printer: Denied

Make sure Windows File Sharing and Printer Sharing are diabled on your network (or at least on that device).