An error occurred while saving the commentPer Inge commented
I have also tried to set up an excel sheet, and set a Range A1:O19. The Excel sheet shows, but the gridlines are drawn to the border of the webpart. Tried to uncheck the View gridlines, but that does not help.
The zone is not wrapped in height to 19 rows. There is 6 additional rows and quite a bit of whitespace towards the bottom of the webpart. So the wepart takes more space than it needs.