su - root
apt update
apt install tmux

# split vertically
CTRL+B %

# split horizontally
CTRL+B "

# switch to next "pane" window
CTRL+B O
# no scroll?
# activate scroll mode to use PageUp and PageDown to scroll up and down terminal output
Ctrl-b then [
# to quit this mode press (a lot of letters have been used for evil lately)
q

creditz:

https://defkey.com/tmux-shortcuts

https://www.poftut.com/split-create-close-tmux-screen-linux/

https://superuser.com/questions/209437/how-do-i-scroll-in-tmux

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