Set the order of multiple cameras

You can create multiple Cameras and assign each one to a different depth. Use the following properties in the CameraA component which creates an image of a particular viewpoint in your scene. The output is either drawn to the screen or captured as a texture. More info
See in Glossary InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
See in Glossary window:

• Depth if your project uses the Built-In Render PipelineA series of operations that take the contents of a Scene, and displays them on a screen. Unity lets you choose from pre-built render pipelines, or write your own. More info
  See in Glossary.
• Priority if your project uses the Universal Render Pipeline (URP).

Cameras are drawn from low depth to high depth. In other words, a Camera with a depth of 2 will be drawn on top of a Camera with a depth of 1. You can adjust the values of the View Rect property to resize and position the Camera’s view onscreen. This can create multiple mini-views like missile cams, map views, rear-view mirrors, etc.