Pro tip: When connected to a Linux host via a serial connection, you can run
eval `resize`
on many hosts to have them query your terminal for its current size, and propagate that to the running applications.
You'll need to re-run that every time you change the terminal size, because there's no SIGWINCH-like mechanism over serial links.
If you use #systemd ≥ 257, it does that for you on login:
https://github.com/systemd/systemd/pull/33707
But only once; size changes afterwards still don't propagate.