If you would like to export a complete list of all custom content titles, you may do so using the Export All Titles button, located in the top right-hand corner of the Titles tab.
Once logged into the admin portal, go to Content Tools -> Custom Content.
The export will contain a complete list of titles, based on the active and expired counts shown to the left of this button.
Depending on the number of titles in your account, there might be slightly more than a few second delay before the download is available.
Once ready, your browser should either prompt, or automatically download an Excel spreadsheet named, "CustomContentTitles.xlsx"