what forms are efiled

I am using turbotax -home and business to efile my federal return

Prior to efiling software asks "do you want to see a preview copy before you efile?"

and a print button with the message "This preview copy includes all tax forms you will be filing with the government"

When you click on it it has pre-selected "Tax return, key calculation worksheets" which I assume is what is being efiled

 

Why are calculation sheets being efiled?

 

If I would have opted to print and mail then the calc sheets are not part of the package.

Pl. explain the discrepancy.

Thanks