1. First, you have to click on the (The Post Grid) button from the left side of the admin bar. Please check the screenshot below-
2. Then you get a popup box with two menus. 1) Layouts (Full page) 2) Sections
2.1. Layouts: There are some pre-made layouts (page demos) that can import any layout from the list. You can filter all layouts by category, free/pro, and keywords. Please check the screenshot for more details-
2.2. Sections: There are a lot of pre-made sections that you can import easily without making this. Please check the screenshot for more details-