Need help to set custom domain without redirecting

hello i have : asNetlify subdomain as Primary domain as Redirects automatically to primary domain
i don’t want the site to be redirect i want it to be the main without redirecting.please tell me how to do that

To change this, do to this settings page:

On that page, click this button to make the www subdomain the primary domain:

You can also force URLs to redirect to URLs with a _redirects file using this rule:* 301!

There is more information about redirect rules here:

and here:

Please let us know if there are other questions about this.