In https://github.com/matomo-org/matomo/issues/13359#issuecomment-424198715 @mattab suggested to maybe remove it only when there is only one URL defined. Could maybe also only replace the main url but it may not be 100% clear for the user why some domains are removed and some not.
Also it would be great to still show the full URL as a tooltip if the domain/main url part was removed.
main url is now only removed if no additional url is defined. Full url should still be shown in the action tooltip