To interact with a panel, you must left-click, middle-click, or right-click on a vacant space on the panel. You can also middle-click or right-click on one of the hide buttons to select the panel, if the panel has no vacant space. If the hide buttons are not visible on a panel, modify the properties of the panel so that the hide buttons are visible.
You use the mouse buttons to interact with a panel in the following ways:
Enables you to grab a panel, then drag the panel to a new location.
Opens the panel popup menu.