External links and embeds (e.g. Airtable views) can be added to your portal or shared view under Links in the Menu section.
Menu Item URL Type
It specifies where the URL for an external link will come from. If you choose the Airtable Field option as the Menu Item URL Type, you will be able to select a field from the user table to use as the source for the URL.
Menu Item Type
Meanwhile, you can select whether to open the link in a new tab or embed it in the portal by setting Menu Item Type for each link.