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Random selection Mode :
This mode allow to select randomly point / polygons using a % of the total or a fixed number

NB : the quantity slider is limited to 100, if you want to select more polygon / points using fixed number, type the number into the field

Starting Shape
This will select 20% of the current point selection
This wil select 20 points randomly
Result : only 20 points are selected
Same thing, with polygons
20 polygons randomly selected