The child theme route worked! Thank you again so much for your assistance with this!
I might have to work with our back end person as we don’t have seem to have a CSS section in the customizer.
https://postimg.cc/LgZzPNT9
Thanks so much for the additional digging into it and for the help!
Unfortunately that didn’t seem to work. I even tried to make it more specific and it still isn’t coming up when I inspect element.
.single-post.content-max-width .wp-block-columns, .single-post.content-max-width .wp-block-text-columns, .single-post .wp-block-columns, .single-post .wp-block-text-columns {
max-width: 850px !important;
}