It's often the case that you want to expand a palette to make more room for puzzle pieces. Normally, palettes automatically resize according to the placement of pieces they contain. It is possible to expand them with this simple technique:
Drag a puzzle piece near the edge of the palette you wish to expand. If you move the piece quickly or in a diagonal direction, the palette remains unchanged. However, if you move the piece slowly, either horizontally or vertically, the size of the palette adjusts to include the location where you are dragging the piece.