Hope you are doing well and sorry for the trouble. As described you want to set the print scale to 'Fit'
The Application remembers the last print settings when you try to print any document next time. Would you mind sharing the version of the Adobe Acrobat 2020 you are using? Go to Help > About Acrobat and make sure you have the latest version installed. Go to Help > Check for updates and reboot the computer once.