how to stop Siri from reading Messages aloud on Mac 15.7

Hey there Don_What,

Thanks for reaching out to the Apple Support Communities.

For steps on how to prevent Siri from reading messages on your Mac, check out the steps listed in this link here: Have messages read out loud in Messages on Mac - Apple Support

1. In the Messages app  on your Mac, select a conversation or select text to be read.

2. Choose Edit > Speech > Start Speaking.

To make the speaking stop, choose Edit > Speech > Stop Speaking.

Let us know if that's able to help.

Take care!