Please go to the “Designs” tab.

You can click on the Edit Button of the design on which you want to edit the content.

Once you click on Edit Design you will come to the Theme Settings for the design.

You can find out more about how to edit Theme Settings from here.

Click on the “Home tab” to start editing the page design of your application.

Let's drag and drop a product grid widget into the page design editor.

You can add products or collections by clicking on the “Add/Edit content” button on the widget.

Next is choosing the “Cart View”.

You will need to choose “Product List View” as well.

You can customize the "Product Detail View"

You can now Click on the "Update Button" to update the design and see the live preview by clicking on the “Preview Button”.