In my opinion it's not a title bar but rather a tab created by macOS. I believe we already had something like that reported elsewhere (not sure if it was mailing list or bug report, can't find it now) where macOS adds an extra tab when

System Preferences->Dock->Prefer tabs when opening documents

is set to "Always". Geany is not a native macOS application and unfortunately doesn't have a control over this extra tab.

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