I cant find Compound Colliders

I am using Unity 2019.3, and I don't see compound colliders. I 3d modeled a car, and I am doing something with torque. When I use a mesh collider, it has these bridges when I set it to convex which makes sense, but when it is not convex, it doesn't work at all. How can I achieve this collider that will perfectly fit the mesh?

 

A compound collider is a collection of convex colliders belonging to the same rigidbody. Simply add your convex colliders to the car as children of the rigidbody.