Glad to hear it was helpful!
Indeed, changing the size of the building area in a space isn’t possible. A workaround would be to scale all your objects smaller. You can select all objects by dragging a selection box with your right mouse button and use the scaling button. Keep in mind that the camera can’t be scaled, so if your world is getting too small, it will feel like you’re a giant!
When you set up a scene, the camera should not be stuck in another object but should have some small space around it, so that the physics can work correctly.
Regarding your issue with the camera, I checked the space and for me, it seems to be working fine. Is it possible that the camera is just hidden behind other objects?
Let me know if this solves the issue or if you need more support. Thank you!