As a Page Manager:
  1. Navigate to School Website.
  2. Select Website Management > Websites
  3. Click the 3-dot button the left of your main site and select Edit website
  4. Select Styles.
  5. Locate your style and click Edit.
  6. Click the Setup toggle in the upper left.
  7. To the right of Used, click the blue expand icon.
  8. This will list where the Style is being used.