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:

    1.    Select Options on the File menu:

Options in PowerPoint 2016

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

Proofing options in PowerPoint 2016

    3.    Click OK.

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

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

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.