How to set pawn's physics simulation?

Hello, I would like to make a simple plane simulator. A plane will be my pawn. I have a root component that is a USceneComponent and a UScaticMesh component attached to it (which is the plane mesh). I am using the C++ basic code template.

I have set my mesh component’s simulate physics to true but still, when I put my plane pawn on the scene, it doesn’t respond to gravity, e.g it doesn’t falling to ground.

How can I make my pawn to respond physics such as gravity?