Website: Block road access in route planning

Dear all,
I need some more explanation if I’ve understood the new function of “closed roads” (Baustelle 500m etc.) correctly.

For sure I’ve understood if I’m on a tour and reaches a closed road I’m able to acitivate this “closed roads” button via the arrow on the left /upper side. But I have to be directly there? I’m not able to change the route and use this function in advance?

Today this happened:
I wanted to plan a new route in the App for a short tour tomorrow. Normally I’m planning on the website and afterwords I’ve tested it also.
As I was looking for the correct adress I did my searching on google maps. There I’ve seen that a part of my route (B13 at Fahrenzhausen) is closed, I think they’re working on the bridge.

B13 closed

Afterwords I changed to kurviger App.
There I wanted to use the new function for closed roads, but I was not able to say kurviger that he should avoid the B13. Activating this button only changed the route here at the beginning.
In other words: is it possible to use this function with the opposite meaning of a intermediate-point - something like “avoiding this point”?
It would be nice not to react tomorrow beeing directly before this closed road and to optimize the route today at home.

For sure I’m able to find a new route with an additional new point not to touch the closed road, but in unknown areas I don’t know what’s reasonable there and on the other hand where are the best, most curvy alternative routes.

Is there any other function I’ve not realised to optimize this problem?

Thanks for further explanations.
Best regards