If it doesn’t page, you can still search and navigate by piping to less.

docker run --help | less

If you want to quickly look up a CLI option, try grep.

$ docker run --help | grep " \-i"
  -i, --interactive                    Keep STDIN open even if not attached

$ docker run --help | grep " \-t"
  -t, --tty                            Allocate a pseudo-TTY

$ docker run --help | grep " \--rm"
      --rm                             Automatically remove the container when it exits