What it is
Zig-Zag stitches are a very basic option to create a simple zig-zag line.
How to Create
Zig-Zag stitches can be created by using a continuous line (without dashes).
Ink/Stitch will create stitches along the path using the stroke width you specified.
Object > Fill and Stroke... and set the desired stroke width in the
Stroke style tab.
Further stitch details can be managed via
Extensions > Ink/Stitch > Params.
Satin Column: A Better Option
It is not recommended to use the Zig-Zag Stitch Mode to create a satin border, use Satin Column instead.
Ink/Stitch will plot zig-zags to the left and right of the line from start to end, but it won’t do anything special around curves and corners. Sharper curves and corners will result in sparse stitching around the outside of the curve and dense stitching around the inside. This won’t look good and may even poke holes in the insides of corners.