Hi,
https://www.openstreetmap.org/way/1421713962 is not a horseback riding center, it is an outdoor riding arena. iD has a different preset for these. Maybe enclosing https://www.openstreetmap.org/way/36838586 can be tagged as a horseback riding center (https://ridethehorse.us/california/alta-loma/canyon-creek-boarding-training/).
Compare
https://wiki.openstreetmap.org/wiki/How_to_map_a#Riding_centre_(equestrian)
https://www.openstreetmap.org/way/840341623#map=17/34.149797/-117.740554&layers=P (example)
