Tested at home with OCPN 2.3.0 Vista CM93 chart set
The enclosed sreencapture shows a small but significant problem
is connected (indicators green)
Location boat in left bottom corner
(9 waypoints in upper center) is 31 nm (leg/route panel)
is 72 nm in the Route Properties (from Route Manager button)
This is because leg 0 (leg zero) is included (the distance from the actual position of the boat to point 1 of the new route).
I like to be able to delete leg "zero" so actual plans can be made for trips not starting at the (virtual) boat location.
I tried to test the same with the GPS
disconnected, but the route manager seems always to remember the last actual GPS location signal and start calculations from that point.