Keynote Presenter Display mirrors on MacBook Pro
Keynote only mirrors display, doesnt separate Presenters display. MacBook Pro Sequoia 15.7.7
MacBook Pro 15″, macOS 15.7
Question marked as
To separate the Presenter Display from your main presentation on macOS, turn off screen mirroring in system settings so that your external monitor extends your desktop instead of duplicating it.
Play a presentation on a separate display in Keynote on Mac - Apple Support