The 1040 is the whole return you are filling out. You are in the 1040. What do you want? Do you want to preview or print it?
You can (and should) preview your return. Go to TAX TOOLS on the Left side.
(You might have to click a little to the left of "Tax Tools" to make it open
Then click on TOOLS
Then View Tax Summary (first link in the Tools Center box)
Then Preview My 1040 on the Left side again
Then Click Back near the top of your screen to exit the preview screen.
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
