# tmux.FormatValues.SessionGroupSize

- **Module:** tmux.FormatValues
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/format_generated.go#L686
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-formatvalues-sessiongroupsize/

```
tmux.FormatValues.SessionGroupSize() -> (int, bool)
```

SessionGroupSize returns tmux #{session_group_size} as int from materialized session-scoped fields (tmux 3.2a or later).