Hello! I have a problem with deleting midi notes in Cubase 10.5. When i select midi clip and then I try to delete midi note in editor it deletes this whole midi track. I try to delete by clicking with right button but delete is also unavailable there in popup menu. Please help I need to finish project for my work fast 
Hi and welcome to the forum,
Is the focus in the Key Editor, at the moment, you press Delete key, please?
Yes 
Hi,
Could you attach a screenshot or a video, please?
Could you try in the Cubase Safe Start Mode [Disable preferences], please?
Using Cubase 13 : I am currently having this exact issue. Did I misadvertantly click some option that messes with window focus?