I can't purge cache, page still cached although i purged anything

After applying the " Apply Recommended Cloudflare Settings for WordPress" in Admin Dashboard.

We can’t purge any cache via WP plugin or Cloudflare dashboard (Caching > Configuration > Custom Purge or Purge Everything)

The messages show cached are purged but the page still load the old version for visitor (only the logged in user see the new one)

How can I purge caches after changing page content?

Do you have an example link where I would see old content?