Investment Studio > Objects > Browser > Overview
Moving from top to bottom, left to right, the Browser object contains

All but the document panel can be hidden by unchecking the corresponding item in the Browser object's pop-up menu:

To open this menu, right-click the toolbar, the status bar or the separator between favorites and document panels (the latter have their own pop-up menus).
When only the document panel is visible, a button appears in its upper left corner:

Click it to open the Browser object's pop-up menu (as opposed to the document panel's own menu).