For friends looking to find games that they can play together without an opposing team (such as Stardew Valley, Payday 2, or the Borderlands Series), looking under the "Cooperative" tag shows largely games that have competitive aspects to them. There is no easy way to find these sorts of games because the Cooperative tag is full of games such as Among Us, Apex Legends, Counter-Strike, and other games you might find in eSports.

I understand that these team games are cooperative in the end, however, they are better suited in the competitive category rather than the Cooperative one. Cooperative should be reserved for games that have Cooperative Multiplayer as their ONLY multiplayer option.