More info. Are you in layout view or story/galley view?
If layout something is wrong. If story/galley, this is normal and you’d need to increase the font size for the display.
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Thanks for the endorsement, Bob!
Just a little more detail for Astoryaday ... you're no doubt in the default Story view. You can switch to Layout view and there the zoom tools will work. When you're in Story or Galley views, all you can do is make the editing font larger on screen from the Galley & Story Appearance toolbar in the lower left corner.
To switch views just click one of the three little window tabs at the top left.