Open a new presentation by clicking Launch Presentation.
Capture the tab in which the presentation is running.
Switch back to this tab.
Remotely control the other presentation using the previous/next buttons.
Worth trying:
Try opening multiple instances. You'll only be controlling the one you capture.
Try refreshing the captured tab. You can still control it.
Remote Control using Capture Handle Demo
Make sure you're running Chrome m92 or later.
If you're seeing this despite using Chrome m92 or later, the Origin Trial on this demo might
have expired. In that case, either [Experimental Web Platform features] or launch the
browser with --enable-blink-features=CaptureHandle.