In cubase 8 and earlier midi recording worked like this:
When recording midi in project view: creates new part.
When recording in key editor (with key editor open) it would merge midi notes that were just recorded while the key editor window was open into that part.
Now in cubase 10 its always creating new midi parts when recording in key editor window.
deleted preferences and everything is working properly again.
surprised no on here recommend to do that.
but worse is that i was just with steinberg support on the phone and the guy told me this was a new feature, and said it behaved exactly the same on his system
My experience is it’s best immediately after 1st record pass that creats the MIDI part is to grab the bottom right handle of the part in the project window and lengthen it to as far as you want to record to, otherwise it will create a new part anyway (regardless of merge setting) once it reaches the end of the part. Once your part is long enough for your recording to fit in, it keeps the same single part. Hope that helps others who’ve been seraching for a fix like i was !