drag the mouse to let a camera around an object 360 rotation

I’ve tried following these steps over and over in 4.13 and it just keeps falling. Is there any way you can go step by step on how you achieved this? I grabbed the observer and player controls from your project and played around with the settings, however no matter what I do the camera keeps going through my walls and environment. Let me know if you need a video to show you the issues I’m running into.