Fujitsu ScanSnap N1800 Operator's Manual page 350

Operations vary according to whether the [Message Screen] is set to [On] or
[Off].
If a job sequence is processed when [Message Screen] is set to [On], the
[Message Screen] will be shown.
HINT
After checking the message, press the [Scan] button to start the scan. If any
further job setup steps are required, press the [OK] button that appears instead.
If a job sequence is processed when [Message Screen] is set to [Off], the
job will be processed without showing the [Message Screen].
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6.14 Processing a Job