End Game a multiplayer Game

Hello, I'm beginer with Photon and I am developing a multiplayer Pong game. I managed to develop the game and make the conditions for victory. But I'm looking

1) How to end a game properly by removing all players from a room and returning to the main menu (the player is disconnected from the server)

2) Return to the lobby while remaining connected to the master server, ready to search for a new game.

Can you help me perform the correct method please ?