Hello,
Depending on which method you have been using to modify things, you could try either of these to reset it back to default:
1. Type "User Personalization" in the Search bar and open the page. Find your login and open the card for it. In the ribbon go to Actions and click on "Clear Personalized Pages".
2. Type "Profiles" in the Search bar and open the page. Find the profile you've modified and open the card for it. In the ribbon go to Actions and click on "Clear Configured Pages".
If you've actually modified the Role Center page object in the development environment then the above steps won't work. You would need to import the original page object from an unmodified Cronus database to restore it to the default configuration.
Cheers,
Rob