Why when scanning does a letter size become a legal size on the Epson xp800 auto scanner. I am using acrobat standard 8. Is there a setting to force the document to be a letter size as it should be
If I am not wrong you are using WIA scanner driver and scanning from the flatbed.
Default setting for this is Legal size. If you want to scan any other size, either change it in the overview or select 'Document feeder' once, change the size and select 'flatbed' again.
Also, you are using an older version of Acrobat. So I suggest you, please use the trial version of latest Acrobat DC- https://acrobat.adobe.com/in/en/free-trial-download.html.