Could someone explain how the gallery filters work?

Upon googling, I know it said something about being inclusive instead of exclusive.But Forgive me, I'm not good at comprehending apparently, I don't understand what they mean.

I don't own seasons and the gallery is showing me a boat load of lots all with season items in it, no matter if I leave seasons checked or seasons unchecked.The only time it doesn't show me seasons lots is when I set the filter to base game.:/

Forgive me if this has already been asked many times, I just didn't completely understand what they were trying to say on the ea forums.So if I don't want to see seasons am I suppose to leave it checked or unchecked?