If you have already imported one of the eStore demos and you want to modify and customize some of its contents for your site then you can easily do it with Customizer.
To get to the WordPress Customizer, navigate to Appearance > Customize from your WordPress dashboard. You will be taken directly to the Customizer interface, with your site preview on the right, and the Customizer menu on the left. From here, you can choose the options you like from Customizer.
eStore Theme provides you with various options to customize your site and make it look impressive. It includes the options to customize each section of your sites, including the header, layouts, menu and a lot more.
If you want to change the content and design each of your site’s pages and posts in a different way, then you can use Select Layout to customize them instead.
All of the Select Layout Options are available in the Page Editor section. To change the appearance or content of specific page or post:
Go to the Pages section from your dashboard.
Choose the Page that you want to customize.
At the right side of the page, you can see the Select Layout option.
How to Change the Content of Demos?