Confused with size of speaker to get when placed along long wall in large room

I have a large open living space approximately 22’ deep x 50’ long x 13’ high.  A combined space arranged from left to right with the living room, dining room, and kitchen.  I am confused as to what size speakers I should be looking at.  The listening area in the living room, is about a third of the entire space, approx. 22’ deep x 16’ long x 13’ high, open on the right to the dining area and kitchen.

My question is, is my listening room considered 22’ x 16’ x 13’, or is it 22’ x 50’ x 13’?

I currently have Klipsch Cornwall speakers setup in a 3’ x 12’ alcove in the living area, along the long 50’ wall.  While happy with the Cornwalls, I want to try new non-horn speakers.  The Cornwalls are about 10’ apart, and 10’ from the listening position.  I don’t often listen at loud volumes.  Mostly low 70’s dB.

The sidewall on the left is mostly glass, but damped by thick drapes.  The sidewall on the right I guess would be practically non-existent, being so open.

My gut tells me that speakers like the Perlisten s7t, ProAc K8, Magico A5, are the correct size.  Something like an Audio Note AN-E sp, or Gershman Grand Avant Garde, are too small.

Thanks for any insight in advance.