Explorer Views
An explorer view is an expandable tree view control, which displays data in a compact hierarchical format. The tree control appears in the side pane of the main content area. Use the tree control as follows:
Select a control for the tree branch that you want to view, and the detail information for that tree branch appears in the main content area.
A folder in the tree preceded by an arrow contains other folders. Click the arrow to expand the folder and show its contents. Click the arrow to collapse the folder again. The list in the main content area always shows the contents of the selected folder in the tree control.
Typically, you can access an explorer view from the second level view bar.
Note: If you cannot access a parent record, then you cannot access
any of that record’s child or grandchild records in an explorer view,
even if you can access the child or grandchild records in other views.