Avidyne IFD550 Pilot's Manual page 131

IFD500 Series Pilot Guide
A visual approach consists of a single flight plan leg aligned with
the runway heading terminating at the runway threshold. Altitude
constraints cannot be entered on the visual approach leg. The
area typically used to display altitude constraints is instead used
to show the glideslope angle associated with the visual approach.
Visual approach in the flight plan
Selection of a base or downwind entry adds no additional legs to
the flight plan. However, to aid in situational awareness, the entry
is shown on the map using dashed lines that intercept the final
approach leg, as shown below:
FMS Subsystem 3-41