Do you you use a viewfinder?
The M1 doesn't have a viewfinder.
My M1 had a viewfinder.
When I mounted my Nikkor 20mm on my M1 and my Nikkor 18mm or 14mm on my M6, I used the entire viewfinder coverage to frame my subject. I framed as tight as possible and knew that everything I saw in the frame would be in the photo plus there would be more along the borders that I could not see in the viewfinder.