Deleting Incorrect CSV Data
If multiple records with data loaded through the CSV import are incorrect, you must delete each record one at a time. No mass delete option is available.
However, you can speed up the process of deleting the field data, instead of having to edit the data inline one field at a time.
To delete field data by editing inline :
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Enable the Edit button on the search results of the data containing the fields you want to delete.
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Select an editable element, in the first row, then hold down the Shift key and select the same element in the last row.
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With all of those fields in the column highlighted, choose delete from the menu on the left.
You can also set your segment size higher in Home > Set Preferences, to do more than 50 at a time.
For more information, see Using Inline Editing.