Settings > Advanced Workplace Options > Domain Mapping

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In order to map your custom domain, you will need to have a free Cloudflare account.

In your domain registrar like Go Daddy, Google Domains update to your nameservers found in your Cloudflare account. Then you A record to point out IP:

In your Cloudflare dashboard set the SSL settings for your domain to be "Full".

If you wish you can use a subdomain. Create an A record with the name of what you want the subdomain to be and then just point it to our IP. Here is an example of what that would look like.