How do i mark all text messages as read on Mac OS?

Hi twnielsen2,

Thanks for using Apple Support Communities. We understand you have some questions about Mail. We're happy to help.

You can select multiple messages by selecting one email, and then holding down the shift key while scrolling until you get to the last one to select. From there, while those are highlighted, go to the top menu, Messages > Mark as read. Let us know that goes.

Thanks!