Hi Bird,
While your U7900 TV may default to Samsung TV Plus at startup, you can customize what happens when the TV powers on. Go to: Settings > All Settings > Advanced Features > Start Screen Option, then enable or disable:
• Start with Smart Hub Home
• Autorun Multi View Casting
• Autorun Multi View Mirroring
If you need help adjusting these options, feel free to reach out to Samsung Support at 1-800-SAMSUNG, 8AM – 12AM EST, 7 days a week. LiveChat agents are also available on our website under ‘Support’.
~ Samsung Advisor