Canon MX870 Series User Manual page 642

Specify the language according to the language of the document to be scanned. Only text
written in languages that can be selected in the Document Language can be extracted to
Notepad.
Combine multiple text conversion results
When scanning multiple documents, select the checkbox to collect the conversion results (text)
into one file.
When the checkbox is selected, you can scan up to 99 pages at one time.
Deselect the checkbox to display each conversion result (text) in a separate file.
When the checkbox is not selected, you can scan up to 10 pages at one time.
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