You are now experiencing, first-hand, the power of Godmin: an admin framework for Rails 4+, tweakable to the max.
Scopes are a way of sectioning resources, useful for quick navigation.
<%= link_to "Read more about scopes", "#" %>Filters offer great flexibility when it comes to searching for resources.
<%= link_to "Read more about filters", "#" %>Batch actions are an easy way to perform the same action on multiple resources.
<%= link_to "Read more about batch actions", "#" %>Control which resources to fetch, and apply arbitrary conditions, such as sorting.
<%= link_to "Read more about resource fetching", "#" %>