In your open return, click on Tax Tools in the left-hand navigation then click Tools in the drop-down menu. In the Tools Center, click on View Tax Summary. When you do this Preview my 1040 displays in the left-hand navigation. If you click on that, you'll be able to see a preview of your return.
You can also Print, Save, or Preview This Year's Return if you select the Print Center in the Tax Tools drop-down and then preview your entire return, including all forms and worksheets (you may be asked to register or pay first).
Please comment if you need additional guidance with this issue.