The Filters side panel is shown when you are viewing the Search Results page.
At the top right of the panel is a toolbar, which consists of these buttons:
Menu - Expand or collapse all filter categories.
- Filters - The Filters panel is selected by default.
- Information - Switch to the Information panel.
- Profiling - Switch to the Profiling panel.
Hide Side Panel - Conceal the current side panel from view.
The filter categories that are shown in the tree depend on whether the search originated from the home page, or the title bar search field, and their respective default filter options.