Here's an example of a Western Tanager that was very close to the minimum focusing distance on my 500mm lens filling a good portion of the frame and positioned right towards me. I worked on getting the eye in focus and am not bothered at all by having the tail feathers and even one foot out of focus.
I love your photo, and the tail being out of focus just helps push my eyes back to the head and eyes in your photo.
Yesterday, "James" at USA Nikon Tech Support figured out my settings issues. He may be the only person there who understands the D780.
I've also found there are two menu pages for Settings, one that applies to DSLR mode, and a different page, with different listings, once I select the Live View (mirrorless). My problem was that something I had selected in my DSLR settings was incompatible once I switched to Live View (mirrorless). Nobody at Nikon could figure this out, but James knew about it.
My goal is to be able to shoot my D780 in both configurations - DSLR and Live View (mirrorless).
In the first case, I am looking at the viewfinder.
In the second case, my eye is far back from the camera, with me looking at the Live View screen (from a distance, of course).
I'd like to test it both ways, then decide what works best for me, for different birds.
I'm going to stop discussing this in the regular forum, as everyone knows that I should never be watching the rear screen.
.......but the only viewfinder on my D780 is OVF, with no provision for EVF.