Hi there,
that isn’t form a site library import.
From a clean install the setup is as follows:
1. Customizer > Layout > Container > Width is set to 900px.
2. Customizer > Layout > Blog – columns are enabled and set to 2 columns.
3. Customizer > Layout > Sidebars – no sidebars on any of the settings.
Most of the other stuff is set to default.
For the rounded corner images – Elvin provide the site owner with the CSS here:
https://generatepress.com/forums/topic/is-this-possible-with-generatepress/#post-1589965
The single post entry meta style ( author and date ) – see this example:
https://docs.generatepress.com/article/entry-meta-style/#example-3
Hope that helps