When solving a puzzle there are various tools prepared for you - Ghost, Image, Arrange, Trays and poking. All can be found in the room main menu except poking.
By the Space key you can spread only the unconnected pieces near the cursor. Place the cursor on the pieces you wish to spread, press the Space key and hold. A circle will be formed around the cursor. You can move the mouse and spread the pieces anywhere on the room desktop. By releasing the Space key you finish the poking. This tool does not work with connected pieces.
Hot key: Space