Hello Michael,
Use a robots.txt instead. This is what I recommend for your robots.txt and sitemap.xml settings for Webflow. This will allow the search engines to index all your site pages. Since Webflow is dynamic and you probably use the CMS for dynamic pages, I do not recommend listing all your pages out manually. You can use that approach however if you prefer.
If you want to exclude a page or folder, you can use this syntax:
Hope this helps!
Bryan