In Easel material zero is always at lower left of material.
Your image above showed what the result was going to be if you positioned center of art at 0,0.
I looked at the link to your project and it was pretty good and no reason for it to run of right or left edge. However was a little close to the bottom.
You have to be careful about text in Easel. There is a bounding box around the text and can scew the centering.