Define all markup settings.
Line Width (Pixels):
The default line width to use for any new markup object. The width is not set to a pure physical unit, instead is it assigned by the (Current zoom level) X (# of Pixels).
Line Style:
Choose the line style, and choose from either: SOLID, ONOFF_DASH, DOUBLE_DASH.
Highlight Mode:
Make any new markup object "see-through".