Overview
I had the opportunity to present using StreamYard, so I made a note of the process.
This guide summarizes the steps to display the Keynote presenter view while sharing only the current slide in StreamYard.
Requirements
You need two displays.
Steps
- Open your presentation in Keynote. Click Play in Window.

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In the top right of the playing window, click Show Presenter Display in Window.

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Confirm that the presenter display is visible.

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In StreamYard, go to Share > Share Screen > Window, and share the playing slideshow.

You can share the playing slideshow on one display while viewing the presenter display on the other.