How to make automatic change of camera position from Static mesh?

Thank you very much for the detailed answer, I set the cube in axonometry yesterday, and this is what came out, I need the cube does not move on the screen, but remains in the center of the screen fixed on one point, how can I do this? this is now the main problem, it seems to move on the screen when resizing, please tell me what could be the cause and how can I fix it?

https://youtu.be/2xXeKMLTEhk?si=J0v_XAx92VgAzwH6