The clipping planes (a.k.a. “slab” ) can be adjusted using Edit -> Clipping and adjusting the slider. There is only one parameter to change and it affects both the front and the back clipping planes 1. The clipping can also be changed using keyboard “D” and “F”.
It can also be changed with Ctrl + Right-mouse drag up and down. Likewise the screen-Z can be changed with Ctrl + Right-mouse left and right 2.
One can “push” and “pull” the view in the screen-Z direction using keypad 3 and keypad “.” (see Section Keyboard Z Translation).