@simonmoon , in this thread, "studio monitor" is being used as a catch all for speakers used in studio monitoring rooms, mixing rooms, mastering rooms, review rooms, etc. Recording studio monitors tend to be smaller out of necessity. Mixing, mastering depends on who is doing it. Some work in small spaces, some work in large spaces. Review rooms, may be mastering rooms, or may be separate and more in line with a home setup.
The distance to the listener is a non starter as home listening positions vary from 6 - 15 feet, so 2.5:1, probably wider than most "studio monitors" on average, but if anything, "studio monitors", at least today, have good integration at most distances.
Rarely see anyone switching between monitors except in final mastering and review where they are testing out the mix to determine how it may sound to a variety of end users. More of that in the past when studio speakers were all over the map.
It is today, 2023 now, so we need to talk about 2023. In 2023, most "studio monitors" are active, with crossovers designed to fix as many issues as practical at the price point, with somewhat flat or very flat response, excellent dispersion characteristics, and low distortion. As this an audiophile site, we would be discussing the mid to upper end of the "studio monitor" space, which will typically mean very flat response on axis, well controlled off axis ie good dispersion and low distortion when the speaker is used within its limits. These are characteristics of all good speakers "studio" or home. They may not have the bass extension, they may not place as loud, and they won't come in your particular shade of sound, but they do what they do very well.