Hi,
Nuendo’s Auto Fades is designed to not show any fades or crossfades on events.
You just set it up and trust that it is doing its job.
If you do a manual fade or crossfade, the autofade will be overridden in that specific case.
Autofades is not designed to be a “default fade” in the sense that it would create adjustable fades on everything. It’s designed to be in the background silently working to smoothen the transitions between events and save you some work by getting rid of a good amount of pops and clicks that would otherwise need attention.