# tmux_pane:join_options/0

- **Package:** libtmux_erlang
- **Language:** Erlang
- **Kind:** typealias
- **Source:** https://github.com/libtmux/libtmux-erlang/blob/d1b6308440cf9eb8f6647e7ae434bce60e849368/apps/libtmux_erlang/src/tmux_pane.erl#L72
- **Page:** https://libtmux.org/en/erlang/latest/reference/t-tmux_pane-join_options-0/

```
-type join_options() ::
          #{direction => horizontal | vertical,
            size =>
                {cells, 1..2147483647} | {percent, 1..100},
            detach => boolean(),
            before => boolean(),
            full_size => boolean()}.
```

Join/move geometry: detach true, vertical split by default. before and full_size follow tmux layout rules.

## Guides

Pages that discuss `join_options/0`.

- [Isolate and rejoin a running pane](/en/erlang/latest/guides/panes/)