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When you use the Row Group Section (or Pivot) with more than one field it would be useful an option Expand All / Collapse All prior to export data in CSV o Excel format
STATUS DETAILS
Needs Votes

Business Central Team (administrator)
Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future. Best regards, Business Central Team