Select View
> Zoom and Navigate > Reset Camera, or click the Reset Camera
button on the Zoom and Navigate toolbar.
If you have moved the camera of a 3D camera view, either by dragging it in 2D plan view or using a navigation tool like Walk Around or Slide, you can use the Reset Camera tool to move the camera back into its original position. Note that this tool is only available when the current view is a 3D view.
To reset the camera to its original position:
Select View
> Zoom and Navigate > Reset Camera, or click the Reset Camera
button on the Zoom and Navigate toolbar.