I dont remember what the problem really was but my most problems with the UE can be solved when you just restart the engine - sound stupid but it can solve a ton of problems
At the moment iam using nav invokers. This can be another reason, why the Volume dont showing up. Nav Invokers only generate they nav volumen arround the character when they start to move
The last thing you can do is go to your project settings and play with the nav volume settings there
One of these 3 points is the solution for my specific problem, i hope its also you solution
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