To set up your scoreboards in scoreboard server place the UEFA Europa League 21 folder in scoreboard-server folder and use these lines in your map_competitions.txt file located in scoreboard server folder.

To use all the scoreboards copy this:
# Group Stage
5, UEFA Europa League 21\Arena Sport 1
5, UEFA Europa League 21\beIN Sports 1
5, UEFA Europa League 21\BT Sport 1
5, UEFA Europa League 21\Canal+
5, UEFA Europa League 21\CBS Sports
5, UEFA Europa League 21\DAZN
5, UEFA Europa League 21\ESPN 2
5, UEFA Europa League 21\MoviStar
5, UEFA Europa League 21\No Logo
5, UEFA Europa League 21\Sky Sports

1029, UEFA Europa League 21\Arena Sport 1
1029, UEFA Europa League 21\beIN Sports 1
1029, UEFA Europa League 21\BT Sport 1
1029, UEFA Europa League 21\Canal+
1029, UEFA Europa League 21\CBS Sports
1029, UEFA Europa League 21\DAZN
1029, UEFA Europa League 21\ESPN 2
1029, UEFA Europa League 21\MoviStar
1029, UEFA Europa League 21\No Logo
1029, UEFA Europa League 21\Sky Sports

2053, UEFA Europa League 21\Arena Sport 1
2053, UEFA Europa League 21\beIN Sports 1
2053, UEFA Europa League 21\BT Sport 1
2053, UEFA Europa League 21\Canal+
2053, UEFA Europa League 21\CBS Sports
2053, UEFA Europa League 21\DAZN
2053, UEFA Europa League 21\MoviStar
2053, UEFA Europa League 21\No Logo
2053, UEFA Europa League 21\Sky Sports

3077, UEFA Europa League 21\Arena Sport 1
3077, UEFA Europa League 21\beIN Sports 1
3077, UEFA Europa League 21\BT Sport 1
3077, UEFA Europa League 21\Canal+
3077, UEFA Europa League 21\CBS Sports
3077, UEFA Europa League 21\DAZN
3077, UEFA Europa League 21\ESPN 2
3077, UEFA Europa League 21\MoviStar
3077, UEFA Europa League 21\No Logo
3077, UEFA Europa League 21\Sky Sports

4101, UEFA Europa League 21\Arena Sport 1
4101, UEFA Europa League 21\beIN Sports 1
4101, UEFA Europa League 21\BT Sport 1
4101, UEFA Europa League 21\Canal+
4101, UEFA Europa League 21\CBS Sports
4101, UEFA Europa League 21\DAZN
4101, UEFA Europa League 21\ESPN 2
4101, UEFA Europa League 21\MoviStar
4101, UEFA Europa League 21\No Logo
4101, UEFA Europa League 21\Sky Sports

5125, UEFA Europa League 21\Arena Sport 1
5125, UEFA Europa League 21\beIN Sports 1
5125, UEFA Europa League 21\BT Sport 1
5125, UEFA Europa League 21\Canal+
5125, UEFA Europa League 21\CBS Sports
5125, UEFA Europa League 21\DAZN
5125, UEFA Europa League 21\ESPN 2
5125, UEFA Europa League 21\MoviStar
5125, UEFA Europa League 21\No Logo
5125, UEFA Europa League 21\Sky Sports

6149, UEFA Europa League 21\Arena Sport 1
6149, UEFA Europa League 21\beIN Sports 1
6149, UEFA Europa League 21\BT Sport 1
6149, UEFA Europa League 21\Canal+
6149, UEFA Europa League 21\CBS Sports
6149, UEFA Europa League 21\DAZN
6149, UEFA Europa League 21\ESPN 2
6149, UEFA Europa League 21\MoviStar
6149, UEFA Europa League 21\No Logo
6149, UEFA Europa League 21\Sky Sports

7173, UEFA Europa League 21\Arena Sport 1
7173, UEFA Europa League 21\beIN Sports 1
7173, UEFA Europa League 21\BT Sport 1
7173, UEFA Europa League 21\Canal+
7173, UEFA Europa League 21\CBS Sports
7173, UEFA Europa League 21\DAZN
7173, UEFA Europa League 21\ESPN 2
7173, UEFA Europa League 21\MoviStar
7173, UEFA Europa League 21\No Logo
7173, UEFA Europa League 21\Sky Sports

8197, UEFA Europa League 21\Arena Sport 1
8197, UEFA Europa League 21\beIN Sports 1
8197, UEFA Europa League 21\BT Sport 1
8197, UEFA Europa League 21\Canal+
8197, UEFA Europa League 21\CBS Sports
8197, UEFA Europa League 21\DAZN
8197, UEFA Europa League 21\ESPN 2
8197, UEFA Europa League 21\MoviStar
8197, UEFA Europa League 21\No Logo
8197, UEFA Europa League 21\Sky Sports

9221, UEFA Europa League 21\Arena Sport 1
9221, UEFA Europa League 21\beIN Sports 1
9221, UEFA Europa League 21\BT Sport 1
9221, UEFA Europa League 21\Canal+
9221, UEFA Europa League 21\CBS Sports
9221, UEFA Europa League 21\DAZN
9221, UEFA Europa League 21\ESPN 2
9221, UEFA Europa League 21\MoviStar
9221, UEFA Europa League 21\No Logo
9221, UEFA Europa League 21\Sky Sports

10245, UEFA Europa League 21\Arena Sport 1
10245, UEFA Europa League 21\beIN Sports 1
10245, UEFA Europa League 21\BT Sport 1
10245, UEFA Europa League 21\Canal+
10245, UEFA Europa League 21\CBS Sports
10245, UEFA Europa League 21\DAZN
10245, UEFA Europa League 21\ESPN 2
10245, UEFA Europa League 21\MoviStar
10245, UEFA Europa League 21\No Logo
10245, UEFA Europa League 21\Sky Sports

11269, UEFA Europa League 21\Arena Sport 1
11269, UEFA Europa League 21\beIN Sports 1
11269, UEFA Europa League 21\BT Sport 1
11269, UEFA Europa League 21\Canal+
11269, UEFA Europa League 21\CBS Sports
11269, UEFA Europa League 21\DAZN
11269, UEFA Europa League 21\ESPN 2
11269, UEFA Europa League 21\MoviStar
11269, UEFA Europa League 21\No Logo
11269, UEFA Europa League 21\Sky Sports

12293, UEFA Europa League 21\Arena Sport 1
12293, UEFA Europa League 21\beIN Sports 1
12293, UEFA Europa League 21\BT Sport 1
12293, UEFA Europa League 21\Canal+
12293, UEFA Europa League 21\CBS Sports
12293, UEFA Europa League 21\DAZN
12293, UEFA Europa League 21\ESPN 2
12293, UEFA Europa League 21\MoviStar
12293, UEFA Europa League 21\No Logo
12293, UEFA Europa League 21\Sky Sports

# Knock Out Stage
6, UEFA Europa League 21\Arena Sport 1
6, UEFA Europa League 21\beIN Sports 1
6, UEFA Europa League 21\BT Sport 1
6, UEFA Europa League 21\Canal+
6, UEFA Europa League 21\CBS Sports
6, UEFA Europa League 21\DAZN
6, UEFA Europa League 21\ESPN 2
6, UEFA Europa League 21\MoviStar
6, UEFA Europa League 21\No Logo
6, UEFA Europa League 21\Sky Sports

To use just one of the scoreboards delete the lines above that you don't want or just put # infront of the scoreboards you don't want to appear like below:

# Group Stage
5, UEFA Europa League 21\beIN Sports 1
1029, UEFA Europa League 21\beIN Sports 1
2053, UEFA Europa League 21\beIN Sports 1
3077, UEFA Europa League 21\beIN Sports 1
4101, UEFA Europa League 21\beIN Sports 1
#4101, UEFA Europa League 21\Canal+
#4101, UEFA Europa League 21\DAZN
5125, UEFA Europa League 21\beIN Sports 1
6149, UEFA Europa League 21\beIN Sports 1
7173, UEFA Europa League 21\beIN Sports 1
8197, UEFA Europa League 21\beIN Sports 1
9221, UEFA Europa League 21\beIN Sports 1
10245, UEFA Europa League 21\beIN Sports 1
11269, UEFA Europa League 21\beIN Sports 1
12293, UEFA Europa League 21\Canal+
#12293, UEFA Europa League 21\beIN Sports 1
# Knockout Stage
6, UEFA Europa League 21\beIN Sports 1

This is also how you would set up a single version of the Europa League scoreboard.