Stopping collisions between certain objects can be useful when projectiles are hitting you and making you go flying. Or when you don’t want people on the same team shooting each other.
First you need to click on “edit” In the top right hand corner of the screen. Then you click on “project setting” which will open a drop down bar, then you click “physics” then there will be a big confusing triangle with names on top and names on the bottom. Where the two things in which you don’t want to collide meet, un-click that box.
This was one of my many challenges in the game I was making during this semester. It took me many more days then