How to import quick Homepage from Demo sites and other elements

First of all, check right side panel of Page and Enable Full width of Browser option and disable Title. See how to do this

Next, if you use Elementor, just Click on Folder Icon and you will find library of pages and blocks

I found that sometimes, if you choose to insert Block template, you will see just empty results. This is bug of Elementor, but you can easily fix this. Simply choose something in category select and clean category selection

if you use WP Bakery, you can also find templates in ready template section