Best is to use Scoreboard Server by zlac (you find it here: 
http://pes-files.ru/pes_2020_scoreboard_server_v1_00_by_zlac)
Copy both folders to your scoreboard-server root and add these lines to your map_competitions.txt:

5, UEFA Europa League ML
6, UEFA Europa League ML
1029, UEFA Europa League ML
2053, UEFA Europa League ML
3077, UEFA Europa League ML
4101, UEFA Europa League ML
5125, UEFA Europa League ML
6149, UEFA Europa League ML
7173, UEFA Europa League ML
8197, UEFA Europa League ML
9221, UEFA Europa League ML
10245, UEFA Europa League ML
11269, UEFA Europa League ML
12293, UEFA Europa League ML
0, UEFA Europa League

In any other case you can just use one game simultaneously.