Most: The Unix Pager on Steroids
jedsoft.org"a powerful paging program for Unix, VMS, MSDOS, and win32 systems"
"can scroll left and right"
Sounds like something from the ancient era, before "less" became popular, but the last update was in 2022-08-04. Weird.
Initial release in 2005 https://en.wikipedia.org/wiki/Most_%28Unix%29
MOST is a paging program includes splitting screens, lockable scrolling, wide file support, ANSI color support, and mouse wheel scrolling.
You know "less" has wide file support and horizontal scrolling (-S), ANSI color support (-R), mouse wheel scrolling (by default)?
It does not have splitting screens, but if you need to do this, then emacs or tmux can help. And I am not sure what "lockable scrolling" means.
Kind of tmux sync panes. Windows locked together, scroll together.
Refer to: [1] https://linux.die.net/man/1/most