User Guide

Choose “Clean Up Paths” from the Element menu, and
there you have it: a “D” with a prominent Beer Belly.
Auto Curvature is not an exact science. You may want to
tweak the BCPs slightly once you get the point in the place
where you want it. But it saves you the effort of constantly
having to tweak BCPs, only to decide later that you like it
elsewhere. After you’re done moving all the paths, we also
recommended that you choose “Clean Up Paths” to put the
extrema at the extremes so that the character (and font)
will hint correctly.
Fontographer User's Manual
3: Altering Outlines Page #27