I’ve created a new URP project through the Unity Hub template. When I select the main camera, the preview doesn’t appear on the Scene view. I’ve checked that the Camera section is expanded on the inspector and that the inspector is not in debug mode.
All the mentioned thing’s don’t work for me. In my case, I had to modify the OverlayMenu itselt. Right-Click on the SceneTab header and selece Overlay Menu. Activate Main Camera there and viola, it should work again.
Is the Gizmos button active in the editor window? If not, select it. If so, open up the gizmos drop down and inspect the options related to the camera.