What is the correct way to begin an offline session?

Hi,

I'm coding the game so it runs with bots offline, and I'd also like it to have an offline mode for unity development in general. However, when I hit play I have to start hosting as using NetworkIdentity and NetworkTransform tends to remove my player until I start a server with NetworkManager (regardless if NetworkManager actually exists or not).

So, I am enquiring what is the correct method to have an offline mode, thanks