How to Redirect Default Netlify Subdomain to Custom Domain
When you add custom domain to your netlify app, the [your].netlify.app not automatically redirect to your custom domain.
To redirect default netlify subdomain to your custom domain, add new file _redirects and save to the root of your website, then fill the _redirects file with the code below.
# Redirect default Netlify subdomain to primary domain
https://[your].netlify.app/* https://[your-domain].com/:splat 301!
# Example: https://budi.netlify.app/* https://budidev.com/:splat 301!In Hugo, save _redirects file to static folder.