Moving the mouse over a drawn shape will change the cursor to indicate different actions.
Clicking "inside" a shape will select it: handles are drawn at the shape's edges. This helps to see the actions to perform.
Items selected with the select tool can be deleted, by pressing the Delete key, from the Toolbar or the Shapes menu.
A shape's position in the "drawing order" can also be adjusted by selecting it, and using the items in the Shapes menu, or the shortcut keys ctrl+up/down. Using ctrl+shift moves the shape to the top or bottom of the order.
When you select an item with the Select tool, it is brought to the front of the list temporarily.
When you deselect, draw or select a new shape, the old shape is drawn back in its correct position.
A shape will be de-selected when:
With an image shape, the diagonal arrows will scale the image, adjusting its size. There will be a green handle drawn in the middle of the image, which can be used to rotate the image around its center point.
Using the Up/Down/Left/Right keyboard arrow keys when a shape is moved will move it. Keep the key held in to move the shape continiously.
When you move a shape towards the edge of the canvas, it will automatically scroll the canvas in the direction you are dragging to. This helps you move a shape around the canvas easily.