Hi 3image, you can use File > New to reset everything in MoI to the same as the initial startup state, that will wipe out any current objects though. You can follow that with a File > Import to bring in the contents of a file you have just saved without changing the views though - Import will not modify your current views unlike Open.

You can also reset all viewports to zoom to fit objects by doing a right-click on the Reset button on the toolbar on the bottom of any viewport. That's not the same as resetting to the start up views though.

So to reset to start up views while keeping your current objects, either save your current objects to a 3DM file or use Ctrl+C to copy them, then use File > New to do the full reset, then use File > Import or Ctrl+V paste to bring back your objects without shifting the view.

- Michael