Web page layout is several widgets put together. You have to add widgets before you customize the layout for your site. In Zsite, you can add, edit, or delete a widget.

Go to "UI"->"Widget". and click "Add" in "Custom" to add a customized widget.

Zsite 4.3 Beta+ has 19 types of widgets available. You can set values for each widget. Take "Latest Article" for example, the values include the number of new articles and the number shown in that widget.