The Preview tab is activated if you have selected the Preview alternative under the Window functions. Under the tab you can preview the lists that you have selected under Print under the Create tab, to see what the lists look like before printing them.
The lists during printout look the same as under the Preview tab, but under the Preview tab you will also find a page header that shows the part number for which you have created a pre-calculation as well as the company, user, date and page number.
When printing, you can also include the settings and the selected parts from the Create tab by using the alternative Print Search Form under Edit in the window menu.