Adding Collision To A Door

I was wondering earlier in this project I was following along, I added a door with simple box collision. I had it to where you could open the door, but it wont close it for some reason. I am in blueprints with in another door and I’m trying to click on simulate physics. Its greyed out because I don’t have the collision I did earlier for some reason. Is there a way to add it while you have it up in blueprints. I thought it was in class settings but I was wrong.