Thanks for the report. That grey block is not part of your scan and will
not be in the saved PDF or DjVu: it is scantpaper’s selection highlight,
drawn over the preview at 20% opacity. The rectangle is kept while you
move between pages so you can preview a crop on each page, and it is
never written into the output, so your PDF is correct.
It currently cannot be dismissed without restarting the application,
which I agree is not obvious.
I'm currently adding a menu item and Esc accelerator to improve the UX
for the next release.
Regards
Jeff
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