Excel to PDF document size

Hi there,

I have a probably a very basic problem but I am not finding my way.

When exporting Excel files to PDF Acrobat converts my A4 Excel files into a Letter size PDF. I could locate where these specifications are in Acrobat in the Preferences menu and as default Excel files will be converted into Letter size PDF.

I can change the values manually but Acrobat won't take them. I've been asked to save my Settings, but I see nowhere in this preferences panel where to load them in order to set the new values for Excels converted to PDF.

Thanks very much in advance for your attention, I hope you have the answer to this.

Best, Estíbalitz.