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Nearest release: v2.1.274, published 2 hours after this site recorded the change. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
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104104 `tmux` has known limitations on certain operating systems and traditionally works best on macOS. Using `tmux -CC` in iTerm2 is the suggested entrypoint into `tmux`.
105105</Note>
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107The default is `"in-process"`. Before v2.1.179 the default was `"auto"`, so upgraded sessions that previously opened split panes now stay in one terminal unless you set the mode explicitly. Set `"auto"` to enable split panes when you're already running inside a tmux session, or when your terminal is iTerm2 with the `it2` CLI installed, falling back to in-process otherwise. The `"tmux"` setting enables split-pane mode and auto-detects whether to use tmux or iTerm2 based on your terminal.
107The default is `"in-process"`. Set `"auto"` to enable split panes when you're already running inside a tmux session, or when your terminal is iTerm2 with the `it2` CLI installed, falling back to in-process otherwise. The `"tmux"` setting enables split-pane mode and auto-detects whether to use tmux or iTerm2 based on your terminal.
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109109As of v2.1.186, set `"iterm2"` to use iTerm2 native split panes explicitly. This mode requires the [`it2` CLI](https://github.com/mkusaka/it2) and shows an error with the install command if `it2` is missing. The setup prompt that offers to install `it2` or switch to tmux appears under `"auto"` or `"tmux"` when your terminal is iTerm2 and tmux is available as a fallback.
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