The Visual Builder might not display your visual changes. This is due to the visual rendering limitations caused by Divi. To preview your changes, save the page and view it. We recommend having a second window open with the page you are editing to go back and forth easily.
We know this might be a bit frustrating, but at this moment there is not much we can do about it. We hope that Divi 5.0 will allow us to produce a better visual rendering of your module.