这可以是屏幕左边显示为列的内置复合应用程序导航器，也可以是呈现按钮列表及其下拉选项的定制控件。
This could be the built-in composite application navigator that appears as a column to the left of the screen, or it could be a custom control that presents a list of buttons with drop-down options.
它是非功能性的；单击按钮或在列表中进行选择都不会对所显示内容有任何影响。
It is not functional; clicking on the buttons or making selections in the lists does not have any effect on what is displayed.
点击编辑应用程序列表按钮。
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