The print view in the template editor allows the user to be able to see and edit the print version of the publication to their needs.
While editing in the desktop version Maglr automatically converts what you have created in the desktop version and creates a suitable pdf version n the print view. But the content from print to the desktop are separate, if you want to add something specific to print, it will not convert to the desktop. The reason for this is that sometimes things converted from desktop to print doesn't always come out the best. For example, if you have a video in the desktop version, attempting to use it in the print version would obviously be pointless! So you may want to delete this in the print version and then simply add a link to the video from the print version.
Such things as popups don't always have the same impact and users may want to instead keep the popups inside of the desktop version and then convert those popups in print to an entire page for themselves.
Once the user is happy with how their print version is made, they can then preview the PDF version of what they will be sending to the user by clicking the orange Preview PDF button, this then generates a PDF preview of the publication, this represents what the user will see when you send the final PDF to your audience.
It is a good idea to check the pdf preview after making several changes to ensure that nothing is out of place. Some users prefer to keep a single subject onto one page and not have a new one start on the same page and then continue onto another. Instead, using the PDF Page Break in PDF Specials area, allows the user to then break the content off of one page so it can then continue/start on the next page, keeping each subject to start on the next page instead of it being confusing and starting on the same page as another and then ending on the next page.