This pattern is the common default canvas page to show that the page is empty and transparent. It also provides a way to align items. This is how Photo Shop pages start out as well.
If you prefer to work on a white background, add a background choosing solid white color.
JasonC -> RE: Page Canvas (6/13/2017 1:37:09 PM)
Just click the background bar to the left of the program and click the button [:)]