Show Camera Preview

When you click on a camera, you get a camera preview in the bottom right corner of the scene view. How can I show a camera preview for cameras that are not selected through an editor script?

You could select a camera in the inspector, then lock that inspector and use another one for other objects.

You could probably also try and change the script provided in the following answer:

select the cemara in the hierarchy,then just expand the “Camera” component in the inspector

You can change the viewport size of the camera. It won’t show in the scene view though, only on the game view.