Why can I look behind meshes?

Hi! I’m new in UE4. I try some things and now I have a problem. If I press play, go to a house and rotate my camera in between of the player and the house. I’m using UE4 4.14 and the ThirdPersonTemplate. How can I solve this? I don’t know how to explain it. So here’s a screenshot.

Sorry that I reply so late.
So “Do Collision Test” is already activated and my camera collide with the meshes, but I can still look into the buildings.

Now I solved the problem. Inside the mesh-detail-panel under “Collision” you can activate “Block-All”.

Find the Spring Arm component in the player character blueprint and tick “Do Collision Test”