If you set it to Proxied (), and start loading the site, and let the site load for 5 - 10 minutes, - do you still see a completely blank page, after having waited for a such while, or do you then see an error page (with an error code and message you can share)?
In if I enable proxy the website load a blank page, is not a loading time issue, is a content missing issue
Sometimes happen that load the cookies policy but still, blank page, no error at all
So sometimes the content appears to be partially loading - although not all of it.
I doubt the Cloudflare Community will be able to do much here, unless we’re able to see the Proxied () record in action, and dig in to what we’re seeing from our end.