To check your workspace row usage, go to Settings > Credit usage in the sidebar. This shows folders, workbooks, and tables sorted by usage, helping you identify what's consuming rows. [1]
Since you've hit the 15M limit, you'll need to delete unused tables. Navigate to the Trash folder from the Home page, select tables, and use "Permanently delete" to free up space. Sort by "Last Modified" to find older, unused tables.
If you still need help managing your workspace limit or deleting tables, I’m here to assist. Would you like to provide more details about what you’re trying to resolve?