Some of the themes does not display this link correctly. If you do not want to modify the theme itself and you do not need the data retention summary in your footer then you can switch it off using the following steps:
- Go to Site administration -> Users -> Privacy and policies -> Privacy settings.
- Uncheck the ‘Show data retention summary’ checkbox and save the changes.
This will remove the ‘Data retention summary’ text from your footer in your Moodle site.