Most folks who export PDF from Finale have been disappointed in the (flawed) PDF export included with the program and instead use a third-party PDF "printer" that installs as an option of your operating system's Print routine. One simply tells Finale to print and chooses the PDF printer as an alternative to your laser or inkjet. Some of these third-party PDF printers are free.

Thank you so much Adrian!

Yes, though sometimes this does not work - I keep getting an 'access is denied' message which I don't understand.

But when printing, I cannot create my own paper size such as 10X13

Exporting in DPF file in older Finale version was not a problem

P.Q.

You need to stop posting the same request on multiple threads. It aggravates the very folks who would like to help you.

https://makemusic.zendesk.com/hc/en-us/community/posts/7640651428247

But when printing, I cannot create my own paper size such as 10X13

You need to set up the page size in both Finale and the PDF printer. Use a third party PDS printer program.

It is bad manners to hijack someone else's thread, BTW. Start your own.