Controls:
Hold Middle Click and move mouse to pan
Pinch gesture OR hold Left Ctrl and scroll to zoom
Ctrl+Z to undo edits; Ctrl+Y to redo edits
Click on an object to select it; hold Left Shift to allow multiple selections
Ctrl+A to select all objects
Click anywhere to deselect all objects; hold Left Shift and click to deselect a single object
Drag and drop selected objects to move them
Ctrl+C to copy selected; Ctrl+V to paste
Press Delete to delete selected objects
Handles for resizing and rotating objects will appear when they are selected.