Change direction of dimension arrowheads

Right-click a dimension, and select:

• OptionsArrowheads Inside to display both arrowheads inside. Clear the check mark to display the arrowheads outside. Available for linear, angular, radial, diameter, baseline, and chain dimensions.
• Options1st Arrowhead Inside or Options2nd Arrowhead Inside. The selected arrowhead switches direction. Available for linear, angular, baseline, and chain dimensions.