Like toolbars, navigation panels can be docked in the navigation pane, or they can float anywhere in the work area. You can hide or close panels you don’t need and open the ones you do. You can also adjust the width of the navigation pane.
By default, some panels, such as Bookmarks, appear in a column on the left side of the work area. Others, such as the Comments panel, appear horizontally across the bottom of the document pane. You can change the orientation of any panel to either vertical or horizontal by dragging the button for that panel, which appears on the left side of the work area.
In either case, a gray frame highlights the entire panel buttons area. If you release the mouse button before the area is highlighted, the panel will float above the work area. If that happens, try again by dragging the panel tab into the upper or lower part of the button area.
By default, only a selected set of panel buttons appears on the left side of the work area. Other panels are included under the View menu and may open as floating panels rather than in the navigation pane. However, you can dock the panel in the navigation pane later.
On the left side of the navigation pane, select the button for the panel.
Choose View > Navigation Panels > [panel name].