The Appearance Inspector controls the visual attributes of objects. Only the controls for those attributes that are editable for the inspected object are enabled.
The Dash Pattern field is used to enter the pattern for custom strokes. Enter number pairs that define resp. the size of the dash and the size of the following gap. E.g. a pattern of 4 2 6 3 will create a dash pattern with a dash of 4 units, followed by a gap of 2 units, a dash of 6 units and a gap of 3 units, and then the pattern repeats itself. The slider behind the dash pattern input field controls the start of the pattern on the stroke. The check box to the right of the slider links the stroke pattern to the line width.
Using blend modes for the fill color allows for convenient highlighting effects that may not be possible with the standard dynamic highlight annotation (use multiply mode). It also makes it possible to change the color (to a lighter and optionally different hue) of existing text on the page (set the target color as the fill color and use the lighten mode option).