Options
Here you can define the degree to which an edge selection should follow a straight line. This value can be adjusted interactively by clicking and dragging in the Viewport.
Lets you define whether the points contained in the edge stroke should be set to constant distances (option enabled) from each other at 100% strength. Affected edge loops with thicknesses that differ greatly will be distorted in unwanted ways.
If this option is disabled, the distance between points will remain relatively constant.