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You can use the Add filter box to add the Hide Found ... -filter.
Probably not the most intuative name, but the weird name is because it's the same filter used in many other pages.
Example: http://project-gc.com/Tools/PQSplit?multi_region[]=Bayern&hidefound=on&hideowned=on&location=N+49%C2%B0+27.232+E+011%C2%B0+04.638&max_distance=34&submit=Filter