Session and Window Preview
sessions
// what it does
`Ctrl + b w` opens `choose-tree` in window mode, expanding each session to show its windows with a live preview pane of the highlighted target. You navigate with arrow keys (or vi/emacs motion), collapse and expand nodes, and press Enter to jump straight to any window in any session. It's the visual way to see everything running at once and hop directly to it.
// shortcut
Ctrl + bw
// gotcha
It's easy to confuse with `Ctrl + b s`: `s` shows sessions collapsed, `w` expands down to individual windows. Older tmux versions render this picker differently, and once bound `w` to the separate `choose-window` command.