Hello @cegasol

You should not edit the files directly if you install the plugin’s updates because WordPress replaces the plugins’ files with the new ones in the update process.

The solution would be to overwrite the styles directly on the form. Please, enter the style definition below through the “Customize Form Design” attribute in the “Form Settings” tab (https://cff.dwbooster.com/images/documentation/form-settings-tab.png):

@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;500&display=swap');

#fbuilder *{font-family:Roboto !important;}

Best regards.