Reset the 3D scene (Fit all)

When the model no longer fits on the screen because it has become too big, you can return to the original size or include the whole model in the view again in a single click.

1.       Click Fit All  in the upper-right corner of the viewer. Alternatively, press the spacebar on your keyboard.

2.     Both the window size and the zoom level are scaled to fit the model to the available screen space.