A *layout rule works like any other rule (see the rules documentation to learn about navigating to and editing rules).

Here is the layout card currently in use on decko.org. 

view (editor) not supported for decko org layout 2

Notice how the layout uses standard Nest Syntax.   These nest work just like any normal nest .

For a layout to function correctly, it must have this nest:

• {{_main}} -- this "contextual name" determines where the main card goes.  For example, if you go to a card named "Hot Dog", then the Hot Dog card will appear where this nest shows up in the layout.   Without this nest, every card with this layout will look the same.