Disable/remove external google fonts

How do I remove/block external google fonts from loading on my site? I am getting this message in pagespeed insights:

Should Fix:
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 3 blocking CSS resources. This causes a delay in rendering your page.

Optimize CSS Delivery of the following:
https://fonts.googleapis.com/css?family=Open+Sans
https://fonts.googleapis.com/css?family=Montserrat:400,700
https://fonts.googleapis.com/css?family=Libre+Baskerville:400italic

My site is https://clovisplumbingservices.com/ … Current theme is Industriple.

The funny part is that these files are from google and yet they are complaining about optimization.