Hi @Nadja,
Unfortunately you won’t get the grey headers in export (only on preview mode) as this is not currently supported. The purpose of that table in export is to show all borders in the cells.
This is what you see in preview:
This is the result in export:
What this Case is explaining is how to have the table format with the # in input whilst avoiding showing all borders in export.
Hope this is clear now.
Best,
Borja