playerprefsSaveKey 

Namespace: SynicSugar.MatchMake
Class: MatchMakeManager

public string playerprefsSaveKey

Description 

The Key to save and load LobbyID of currently belonging to Lobby. Valid only when Playerprefs is selected on lobbyIdSaveType.

Can set this value on UnityEditor. default is eos_lobbyid

using SynicSugar.MatchMake;

public class MatchmakingConfig : MonoBehaviour {
    public void ChangeConfig(){
        MatchMakeManager.Instance.playerprefsSaveKey = "savekey";
    }
}