How to make 3D gray light background effect picture

1. First open the 3dMax software and select a view.

2. Then select View in the menu bar above and click Viewport Configuration.

3. Click on the background, use the custom user interface gradient color settings, use the custom user interface solid color settings, use the environment background settings, use the file settings

4. Click on the file, in In the dialog box that pops up, select the desired background, click Open, and finally click Save.