In a few weeks this feature will be available also on iOS.
We refer to this feature as "Excluded leagues".
On Section "Leagues" there is a switch next to each available league.
When it is green the specific league is active on all the sections of the App.
When it is red the specific league is one of the excluded leagues.
You can see all your excluded leagues on the tab with the red icon.
When you want to exclude a league you just change the switch to the left (red).
If you want to restore a league you just change the switch to the right (green).
Exclude the leagues that you never use. You will have better performance and less data traffic.