You
can preview sketch dimensions when you select a sketch
entity.
You
can select the dimension to edit it. When you click anywhere else in the graphics area,
the preview dimension disappears.
To turn on sketch dimension previews, click and select Preview sketch dimension when
selected.
To change the dimension preview color, click . Under Color scheme settings,
edit the color for Dimensions, Preview.
Sketch dimension previews are not supported for path
lengths.