puzzle piece stuck under pocket

hi i have a puzzle piece that is stuck under the pocket.
this happens after i sort the pieces....is there a way to get to it
or close the pocket completly off the screen?

What I always do is make sure there are other pieces in that same general area that are visible...then, click/drag to select the visible pieces and keep dragging to the upper left corner. This will select all pieces in the area...then, just drag all of them down until you can see the hidden piece.