I"m using Xara Web Designer MX Premium 8

When I place text or an image on the right side of my page then go into the preview to look at it, the right side is always cut off. I have to keep moving the text box or image over over over til it's darn near in the middle of the page, for it to show up not cut off in the preview. To me, this looks horrible and it is extremely annoying. Can someone explain to me the reason for this, or what I"m doing wrong, how to fix it, ect. please. Thank you.