slurs collide with flats

Dorico is so vastly better than my previous program in not creating collisions between articulations and other things!
However, I often find that the slur goes thru the flat symbol. Any way to correct this?

Engraving menu, Engraving Options, Slurs.

Near the end of the (long) list there is an option whether or not slurs can cross the stems of flats. (Slurs crossing flats, but not sharps, is normally acceptable practice, AFAIK)

Thank you!!!