VPN? Does it affect Screen Mirroring (Smart View) between android and Smart TV? Why Bluetooth ON?

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9. I have been interested in the topic and reading this thread

This info from Proton sounds correct. Screen sharing is like picking up the extension on a wired house phone allowing both people to listen to the caller. This only works when both phones share a common line. Lots of VPN configurations make sharing impossible like having 2 house phones on 2 separate lines. I have used a software tool called Synergy which allows me share a single mouse and keyboard across 2 or more computers. The computers "talk" to each other over the LAN and coordinate the sharing of the mouse and keyboard. This stops working if one of the computers connects to my VPN at work.

The best solution (IMHO) is to configure the VPN connection from the router rather than an individual device. That allows all of the devices on your LAN to still "talk" to each other.

I have a Synology RT2600ac router which allows configuring a VPN at the router. I would use this option since it would allow any device on your LAN to access the VPN and screen share with any other device.