When exporting Salesforce Lightning reports in Formatted Report view in Lightning or Printable View in Classic, Long Text Area and Rich Text Area fields, are truncated to 255 characters or as it appears on the report run page.
For example, a support manager exporting a Cases report with a Description field needs the full field content. Selecting Details Only export with .csv format ensures no truncation occurs.
When exporting Salesforce Lightning reports, to export the entire content of the field, select the export view as Details Only with .csv or .xls formats.
Notes:
There is a related Idea posted on IdeaExchange. Please consider voting for the idea to support implementing the enhancement feature.
More than 255 characters in a Long Text Area Custom Field is not visible
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