|Click "File > New canvas" menu item and the New canvas
dialog will appear. Input the width and height of the canvas, and click
the "Change color" button to change the color of the canvas. Click "OK" to
create the new canvas, or click "Cancel" to cancel.
is already a canvas in the window. The New canvas command will
delete the old canvas. So make sure to save the old project before create
a new canvas.
Most time user don't need to create a new canvas manually. The canvas
will be created automatically when you open an image file, paste an image
from the clipboard or capture a new screenshot.