How to open Audio Part Editor?

Not exactly new to Cubase. But how can I open the Audio Part Editor - not the Sample Editor? “Open Audio Part Edit” is greyed out in the Audio menu no matter what I do. Double clicking the audio event in the project window open the sample editor?

What am I missing here?

As the namer implies, the audio part editor is for audio parts - make the event a part.
There is even a dedicated chapter about parts and event in the manual

Yeah there’s an option in the Audio menu “Events to Part”

An Audio Part is a container that holds one or more Audio Events. The Part Editor does not edit Events, only Parts.

Found it, thanks! Like so many things I never used…