I have installed GP Premium in three different sites and in a new “empty” site (all having the same WP version 4.9.8). In the new “empty” site I can observe two differences compared to the other three: 1- in Extra Css there is a lot of Css code labeled /* GeneratePress Site CSS */ 2- In the Elements screen there is also a “Legacy Page Headers” tab. Why are there differences in the installations?
Yes, the CSS, media, posts etc will be left overs from the Site import.
New installs of 1.7 add the elements module, instead of the hooks and page headers, when importing the Site the Page Headers that came with it are the old page headers, hence the Legacy is displayed.
This will be the same if you update an existing site to 1.7 and activate the elements module.