After you file

Even when selecting "File By Mail", TurboTax Business 2022 does not give me any details on where to send the printed amended Federal Forms:

In fact, it makes it seem like nothing has to be filed for the Federal.  How can this be, when I have a 1065-X that was filled out?

My understanding is the 1065-X must be filed with the 'service center' that the original return was filed at; however, my original return was e-filed.  How can I find out the service center?