Resize current pane by 5 cells at a time
panes
// what it does
Ctrl+b followed by Alt+arrow resizes the pane in 5-cell steps (e.g. resize-pane -D 5), moving the divider in bigger jumps than the single-cell Ctrl-arrow bindings. Reach for it when you need to reshape a pane quickly instead of nudging one row or column at a time. The arrow direction sets which edge moves.
// shortcut
Ctrl + bAlt + ↑
Ctrl + bAlt + ↓
Ctrl + bAlt + →
Ctrl + bAlt + ←
// gotcha
5-cell steps easily overshoot a small target, and like all resizes they're capped by neighboring panes' minimum sizes. On many terminals Alt (Meta) isn't forwarded unless enabled, so these bindings may not fire until your terminal sends a real Meta key.