The view changes to the First person view. The
Alt
key is used to switch from first person view to third person view.
The first person view.

Use the
standard keyboard up and down arrows to move a manikin forward and backward.
The right and left arrows rotate the manikin in a standing posture to the
respective direction.

Restoring to
the original view, exit or click Esc.
In the third person view, a dockable immersive panel, which docks to the
right side of the screen by default is available to apply predefined
postures.