All actions in this dialog are just performed for the current view window.

This dialog is displayed when clicking on the Dialogs->Layer Manager. Enables to configure the elements visibility and priority. The available options are grouped in two column :
Visible : Visibility of the entity
Stencil : Priority to display the entity
In this menu, you see Hull entity, this is convex hulls of the graph. When you click on visible, hierarchy of convex hulls are build. The name of a hull is the name of the coresponding subgraph.
In futur version you could add/modify/remove entity