Turn off red, wavy underlines for spelling errors

PowerPoint 365
If you don't want to see the red, wavy underlines on-screen, you can turn this feature off by three simple clicks:

   1.   Select Options on the File menu:

Options in PowerPoint 2016

   2.   On the Proofing tab, click the Hide spelling and grammar errors checkbox:

Proofing options in PowerPoint 2016

   3.   Click OK.

This just turns the underlines off; it doesn't prevent PowerPoint from checking to spell as you type.

To stop check spelling at all, just click Check spelling as you type checkbox:

Proofing options in PowerPoint 2016

Turning off Check spelling as you type relieves PowerPoint of a small processing burden, making it run a bit faster.

See also this tip in French: Désactiver les soulignements rouges et ondulés pour les fautes d'orthographe.

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Turn off red, wavy underlines for spelling errors

Turn off red, wavy underlines for spelling errors

If you don't want to see the red, wavy underlines on-screen, you can turn this feature off by three simple clicks:
Turn off red, wavy underlines for spelling errors

Turn off red, wavy underlines for spelling errors

By default, the PowerPoint spelling checker checks the spelling in all text elements in the presentation: slides, outlines, note pages, and handout pages. Like other Microsoft applications such as Word and Excel, PowerPoint underlines all words that it cannot find in its dictionary and might be misspelled with a red wavy underline.
Run spelling check for PowerPoint presentation

Run spelling check for PowerPoint presentation

By default, PowerPoint automatically checks the spelling of the entire presentation: all slides, outlines, notes pages, and handout pages. You can disable this feature and skip spell-checking for certain text.