Route syncing Strava and Komoot

How does auto-syncing for routes work exactly?

I have the feeling that routes that I delete von Strava/Komoot stay on the watch. So a lot of junk is piling up on the tiny screen.

The watch ignores whether it is a run or cycling route. I start a run and get to see all cycling routes.

Does a route that I delete on the watch, but keep on Strava, get re-synced?

Is there an overview on the watch for saved routes? Like the one for sensors.