PSLTSCALE system variable
Paper space linetype scale
Specifies the linetype scaling in paper space. If On or 1, the length of the dashes is based on paper space drawing units. Linetypes display identically, in various viewports which are scaled differently. This means that the linetype scaling is independent from the viewport scale. When changing PSLTSCALE, REGEN or REGENALL is needed to update the display.
0 to 1
0: No special linetype scaling
1: Viewport scaling governs linetype scaling