Hyperglance users can control the visibility of resources from the 'Resource Visibility' option in the top right control menu. Clicking on the control, brings a drop down which lists all the datasources as tabs and under each datasource - a list of resource types. It also has a handy 'show all' and 'hide all' options.
When a user clicks on a type of a currently visible resource (indicated with a blue tick mark), it hides all resources of the chosen type from the diagram. All links connecting these resources to any other resource types with disappear too. Clicking on it again will bring both the resources & links back in the diagram.