I’m trying to figure out how to add a header region to a spreadsheet that doesn’t have one. For example, the Simple CRM template in the gallery. You can insert a few rows at the top and then define a row to be the header row, but then you lose the headings - kind of a pain to have to do that with each table. If all of the templates in the gallery include header regions, then you may not ever need to worry about this issue. Unless there is a specific reason to not include a header region, I’d recommend modifying the templates so that they have at least 2 rows in the header (one for the title of the worksheet).
We are aware of this issue and plan to fix it soon. Tracking issue: #001386