I have also such a thing.
I think it is made for our comfort.
If I can make a request to the development team, surely it would be nothing for the next site update to include a toggle to hide or show tournaments that we are no longer active in. I'd find that filter very handy.
Starting today my tournament list started showing tournaments that are still in progress that I am no longer active in. Previously these did not show up. Is there a way to filter it so it is hiding these again?