My photo does not show fully in the canvas project?

For canvas products, we have a wide fold/bleed area due to the thickness of the final products, and with the default template, the image has to fill the entire bleed/fold area as well to avoid having a blank area at the canvas sides. You can see the bleed area by going to Project and enabling Show Bleeds. You can also change the canvas design by going to Layouts on the left, then drag and drop your preferred layout into the template.