If you want to remove the current connection as a metered one, then go the #Networks by clicking the network icon and then right click on the connection and select Set as non-metered connection. Once you have done this, #Outlook will not show you the warning about metered connection.
https://ibmimedia.com/explore/cant-send-or-receive-email-in-outlook-and-metered-connection-warning-is-triggered
