I have seen, that overlays are deleted when importing a route.
For me this is not useful: I plan multiple routes in a region, for that I load several overlays (other routes, driven tracks, mountain passes, …) located in separate files.
If I switch from one route in work to an other (via import) all overlays are gone and I have to import them again .
Therefore I would prefer to delete the overlays manually (function already implemented).
Ah - got it. There is a change of behaviour compared to Kurviger 2.
So for me it works this way:
delete current route
import new route using extend option
→ Overlay is kept
The new philosophy / behaviour might be better - currently I can not judge it yet because I am used to have the old behaviour.
In the old behaviour I had to delete the overlay manually now and then - in the new behaviour I have to set up my whole overlay again, if it has been deleted unintendedly.