Welcome Robert at our great Forum here.

Your problem has to do with your template settings and yes you can change them.

In short: make an Excelfile with the desired settings (not only papersize, but font, color, footer etc.). Save that in the right place not as .xlsx, but as xlst file.

Next time you open Excel it uses that as default settings.

I found an old explanation for where this template file is stored here on the website:  https://www.myonlinetraininghub.com/customize-default-excel-workbook

You have to find out yourself if you can find the right settings in your situation with this page.

If it is not clear enough, come back here and we'll give you an instruction how to fix it.

good luck!

Frans