How to zoom (equal to ctrl+scroll) while playing a presentation?

I've searched but it seems everyone wants to zoom or magnify to edit. I however am wanting to zoom in or magnify certain parts of my presentation while I'm actually playing the presentation so that people sitting in the back of the conference room can see a specific detail. The ctrl+scroll option in osx is exactly what I need, but when in presentation mode in keynote, that pulls up a menu of my slides and starts scrolling through them. Is there some equivalent that I can use here?
The things I need to zoom in on are different every time I present based on specific questions crowd members ask, so I can't just build additional/enlarged images into my presentation. Thanks in advance for your help!

Welcome to the forums!
To do what you want, you need to first go into the Keynote Preferences, under Slideshow, and check the option "Allow Expose, Dashboard, and others to use screen". Once this is done, you should now see Control-Scroll working as you expect.
Note that there are other possible options as well, specifically, apps that allow you to magnify portions of the screen. One is OmniDazzle, which is a somewhat silly app that has as one of its features the ability to magnify a selected portion of the screen. You should be able to find other apps with similar functionality.

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How to zoom (equal to ctrl+scroll) while playing a presentation?

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