Changing the Canvas Size
Change your game UI canvas size to visualize how your canvas might look on other displays and devices of varying resolutions. The size at which you save your canvas is the reference size that is used when you perform the Scale to Device action.
To change the canvas size
On the toolbar, click the arrow beside the resolution to see a list of commonly used canvas sizes for various platforms.
Select the size you want or click Other to enter a custom canvas size.
