U NET - How shold i pass LOBBY SETTINGS to the GAME SCENE to all PLAYERS?

Hello, i am stuck with somethig, i dont know whats the propper way to save the game settings in U Net.
Ex:
You join a match.
The host select the map size.
Then everybody is ready and the game starts.
-- Here, where shold i save the new map size, the players count... --

Thanks for your time!