"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.
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.
Refer to: [1] https://linux.die.net/man/1/most
