Simple program to draw a triangle, except the axises are rotated by 90 degrees clockwise and are zoomed in.

I have this basic orbit camera controller set up. The pitch works perfectly fine, but I am failing to properly get the Yaw to orbit around the object horizontally (like a model viewer or blender orbit camera). It appears to just Roll in place, instead of Yaw. I have tried multiple implementations, but none actually stop the camera from rolling. Thank you for any assistance.