DNN has three display modes for administrators: View, Edit, and Layout.

View Mode: Displays the page as visitors see it.

Edit Mode: Allows you to edit the content inside modules.

Layout Mode: This powerful mode lets you manage the layout of modules on the page. In this mode, you can easily drag and drop modules between different panes of the theme, add new modules, or remove modules from the page. This mode is ideal for visually designing the structure of pages.