Some time between January and now, a new preview feature was included in Power BI Portal. It’s a new Manage Connections and Gateway window, still in preview. We can access this option on the Settings button.
In the past, the connections were related to on-premises data gateways. For each gateway we could create many connections and manage who would be the users with permissions to re-use these connections.
This is a separation of responsibilities: A Power BI Administrator, or gateway administrator, can be the responsible to create and manage the connections, while Power BI developers can use the connections