and also when I update something on the websites like post or image in the backend. at the front, it shows the URL as https://patios.myshopify.com.
please help me with this problem. what I can do to resolve this problem.
Ana here from the Shopify support team. :)
You'll want to head to Online Store>Domains in your Shopify admin, and make sure that at the very top, you have selected your custom domain (i.e. www.website.com) as the primary domain. You should also make sure that the "Redirect all traffic to this domain" checkbox is ticked, like so:
That should fix this issue right up! :)