The three contexts are Visualforce Page, Explorer, and Page Layout. The key difference among them is where they are accessed from in Salesforce. Views with Explorer and Visualforce Page contexts are available from the ActionGrid Explorer or a Visualforce page of the object.
To change the context of a view, click the drop-down arrow next to Manage Views screen.and select . Then modify the field in the
If the Context field is not visible, click Configure in the Manage Views screen. Click the Context check box under ActionGrid View Fields.
Views with a Page Layout context will not be available from the ActionGrid Explorer or Visualforce pages. They can only be accessed from a related list ActionGrid on a Salesforce page layout.