Hi Chris,
2 collections (List) == 2 contexts in charge in the Plural view. In the Builder, you have to name/alias your 2 distincts views.
Then, if you create a Link, Task: Edit, and choose Item context (All Layouts / Plural Name / Single Name), the Builder will create the separated Layouts to display.
File: (views/Plural/view.html.php)
The first will be Default, and the others will be named as defined Aliases.
/**
* List of the reachables layouts. Fill this array in every view file.
*
* @var array
*/
protected $layouts = array( 'default', 'Alias1', 'Alias2', 'modal', 'ajax');
In that case, if you Edit or add New Item from this List, all the Tasks (Save&Close, Cancel, ...) will redirect to the Parent List (right context)