Excel 16.19 version for Mac, saving to PDF issues

Hi,

When trying to save (print) an Excel sheet as PDF in a custom paper size in Mac, (i.e. 10" x 33") the Excel chart only occupies about the size of a regular letter page (8.5" x 11" or so) on the top of the whole page, instead of filling the large paper format. I used to have Office for Mac 2011 and this was not an issue.

Thanks for your help!