How can I change the font size or bold text in a confirmation message in Google Forms?

You can change the default confirmation message in Google Forms, but it does not allow you to format the text. You can use the Formfacade add-on to customize the message, change the font size or bold text for emphasis, add images or hyperlinks & more.

How to the format the confirmation message text?

Formfacade supports markdown language so that you can easily format the text. You can change the font size, make it bold or italicized, add a hyperlink or more. You can check out the markdown guide for more details: https://www.markdownguide.org/basic-syntax/

Using Formfacade add-on to customize the message

Pre-requisite: You must have installed the Formfacade add-on for Google Forms. If you haven't installed the add-on yet, you can install it from G Suite marketplace using this link. https://gsuite.google.com/marketplace/app/formfacade/743872305260