A black border appears under the VR rendering camera view

Change the perspective window to the camera view, and then use SHIFT+F, which is the fast forward key to display the safe box. What is displayed in the safe box is the actual rendered size and what is seen.

In addition, you made an error. There are two possible reasons. One is to adjust the manual cutting option under the modification panel; the other is that the camera angle is not adjusted properly, causing light leakage.

It should be the latter, and the camera height and field of view are unreasonable. According to your picture, the camera height should be 900--1200MM. Don’t let the camera’s line of sight touch the wall in the top view. .