Use arrow keys/WASD to move. Press space to place an object. TP button teleports you to a specific place.
This is an example infinite area in scratch, where you can have infinite x and y coordinates. All you need to do to use this in your project is get rid of the [When space key pressed] script of the scratch logo, and the [When green flag clicked] script of the cat, and put them in your backpack. When you want to move something, change the scrollX and scrollY variables, so you'd do "change scrollX by 10" instead of "change x position by 10".
