The vertical line in the field of view of 3d max camera is not straight, resulting in downward perspective. How to solve it? You can't adjust the angle. Do you want to change the parameters?

After selecting the camera, right-click anywhere on the screen and select "Apply Camera Correction Modifier" from the menu in the upper left corner of the pop-up quad menu. He will automatically estimate a value to make the object in the camera view look less inclined, and you can also change that value to adjust the inclination appropriately.