The Use this Character to Replace Scrubbed Information setting specifies the default character that will be used to replace personal information you choose to Scrub. You can choose any digit 0 through 9 or X. You can also enable Scrub All Characters of an Identity Match Except for the Last Four. This setting will only replace the leading characters in your personal information and leave the remaining four characters in their original state. For example, 123-45-6789 will become XXX-XX-6789.
To view or modify this setting, click the Configuration ribbon, then the Settings button. For additional settings please refer to Change the Behavior of the Actions Used to Protect Identities or Settings to Customize Your Experience.