# plan.ops.panes.SplitWindow.focus

- **Module:** plan.ops.panes.SplitWindow
- **Package:** libtmux
- **Language:** Rust
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-rs/blob/f0e37052c232636b61d095817046e6bfc8f2ca40/crates/libtmux/src/plan/ops/panes.rs#L157
- **Page:** https://libtmux.org/en/rs/latest/reference/plan-ops-panes-splitwindow-focus/

```
plan.ops.panes.SplitWindow.focus(mut) -> Self
```

Leave the new pane focused.

A focused split is what makes the `{marked}` fold available: the
register the fold marks is the active pane.