Each form in the theme is configurable through the Quform plugin. To edit your existing forms, go to Quform → Forms on the WordPress menu. Hover the form you want to edit and click Edit. Help for the Quform plugin is available at the Quform help section.
Use React Quform theme
React has it’s own Quform theme that works optimally with React, it’s responsive and it is set up to use the themes color schemes and palettes.
Go to: WordPress Menu → Quform → Form Builder → Settings → Style → Themes → React
React comes with forms templates ready for you to use, you will need to import them first. See the page Setting up the contact & register forms for how to do this.
You can find more form import templates at https://www.quform.com/examples