How do I fix this - my 24 inch imac indicates its screen is 16.5 inch

My 24 inch iMac began displaying everything much bigger than normal today.  The system preferences display resolution is set to 1280 x 800 which is normal, but in Displays under the About this Mac it says the display is 16.5 inches.
What happened? And how do I fix this?

Click on the Desktop, select Help->Mac Help->search for ZOOM and you'll probably find that you've inadvertently activated an Universal Access setting.

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