On this pageAdding colision to objectsPutting a collision on an objectStep 1Select the object where the collision will be placed, to find out how to create an object, go to Create primitive objects.Step 2Click + to open the component options.Step 3Select Collision.Step 4And now select the collision type, just for example, we will choose Sphere collider.ResultNow your object has a collision, but remember, if an object crosses another it means it doesn't have a collision, check if both objects have a collision.