Subpanels
Above each control on the main panel is a tab marked with a triangle. Clicking this tab displays the subpanel, whose name is indicated on its title bar.
Subpanels contain:
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A labelled copy of the control in the Main Panel.
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Other controls for running applications. (You can promote these to the Main Panel.)
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An Install Icon control, which acts as a drop zone for adding a control to the subpanel.