Unity/photon/pun2/部屋オプション変更

入室可否変更

if (PhotonNetwork.InRoom)
{
    PhotonNetwork.CurrentRoom.IsOpen = isOpen;
}

参考：https://gamefbb.com/%E3%80%90unity%E3%80%91%E3%83%AB%E3%83%BC%E3%83%A0%E3%81%AE%E3%83%97%E3%83%AD%E3%83%91%E3%83%86%E3%82%A3%E3%82%92%E6%9B%B4%E6%96%B0%E3%81%99%E3%82%8B%E3%80%90pun2%E3%80%91/