How to Disable outside network access

i installed an EUFY pan & tilt camera in my home. Everything works. However, I wanted to make a simple test, I disable wifi from my mobile phone and check if I was able to access the camera. I was hoping to NOT be able to see the stream, but instead I was.

In fact, for greater security, I DO NOT want to be able to access my camera from outside of my home. I want to VPN to home and from there be able to see it. I couldn’t find a way to disable it. Seems therefore that Eufy is pushing the stream to their servers and then forwarding it to me. I really don’t want it. Is it possible?

You could ask here as well :