Open, close, and show panels and windows
Even if a panel is open, it may be out
of sight, beneath other panels. Choosing a panel from the Window
menu opens it and brings it to the front of its group.
When you close a panel group in the application window, the other
groups resize to use the newly available space. When you close a
floating window, the panels within it close, too.
To open or close a panel, choose the panel from the Window
menu.
To close a panel or window, click its Close button
.
To open or close a panel, use its keyboard shortcut.
If a frame contains multiple panels, place the pointer over
a tab and roll the mouse scroll wheel forward or backward to change
which panel is active.
If a frame contains more grouped panels than can be shown
at once, drag the scroll bar that appears above the tabs.

Scroll bar for showing tabs of other panels