It looks like you have turned your device. We can't turn the canvas, and it no longer fits on the screen. You can reset the canvas, but it will destroy your drawing.
Turn your device back
OR
It looks like you have resized your screen. We can't resize the canvas, and it no longer fits on the screen. You can reset the canvas, but it will destroy your drawing.
Resize your device back
OR
Are you sure you want to destory your canvas?
Are you sure you want to destory your canvas?