For a domain of the form notionlayer.com, please follow the guide for your domain provider:
Generic/All other providers (Based on Cloudflare)
Go to DNS Records configuration of your domain provider.
Fill in the form as follows:
Type: For root domains you should select ALIAS , CNAME/ALIAS , or sometimes CNAME depending on your provider. Some providers do not support ALIAS type, if this is the case, please contact us for support.
Name: Sometimes called “Path” should be set to @ or just left empty on some providers. The management panel should direct you in the right way.
Target: This should be set to fork.notionlayer.com.
Note that since this provider (Cloudflare) automatically adds the . to the end of fork.notionlayer.com as seen below you can omit it in the target settings.