As we answered in Comments – https://www.8theme.com/topic/not-able-to-find-home-default-red-demo/ , you need to install Default demo version https://prnt.sc/1rol28j , then import Red Home page, we will help with the header and you will get the mentioned demo. But, you have installed niche-market demo, not the default one.
It is recommended to run import on a fresh WordPress installation. For this you can use WordPress Database Reset plugin https://wordpress.org/plugins/wordpress-database-reset/ The plugin can be used to remove all the existing content and install a new version from scratch. It is recommended to disable the theme https://prnt.sc/unle03 before the reset.
So do reset the current content, and do the mentioned import then. Or let us know after the reset and we will do the import for you.
