To apply sketchy lines to the current view, define settings in the Graphic Display Options dialog.
Graphic Display Options. A value of 0 results in straight lines without the hand-sketched graphic style. A value of 10 results in multiple sketch lines with a higher degree of wave to each model line.
In the following examples, Extension = 5, but the Jitter value changes.

Jitter = 0

Jitter = 5

Jitter = 10
A value of 0 results in lines that meet at intersections. A value of 10 results in lines that extend well beyond intersections.
In the following examples, Jitter = 5, but the Extension value changes.

Extension = 0

Extension = 5

Extension = 10