Hi,
Wow, I have never seen this. 
How did you get into this state, please? Is it always reproducible? Or is it gone when you close and reopen the window? Is it reproducible in Cubase Safe Start Mode?
it is wishful thinking
It doesnt address the fact that if your adding more than one track you can’t deal with configuring ins and outs in that windows. I think it needs a tab style dialog to deal with say adding 16 audio tracks and configuring them in the dialog