Choose commands from: Filters the list of commands and items you can add to the Ribbon. The default is Popular Commands, though you can change it depending on what you need to do. For example, if you're replacing a top level tab with a custom tab, you can filter to only see Main Tabs.
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Popular Commands   Shows commonly used commands such as alignment, font settings, and file save.
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Commands Not in the Ribbon   Displays commands that are not currently in use on the ribbon.
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All Commands   Shows all available Word commands.
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Macros   Lists macros that you've written or recorded that can be added to the ribbon.
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File Tab   Displays commands that are associated with the File tab.
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All Tabs   Commands currently on all ribbon tabs. Includes Main, Tool, and Custom tabs.
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Main Tabs   Lists only the top level tabs, such as Home, Insert, Design, or View.
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Tool Tabs   Shows contextual tabs and groups that only appear when working on a specific task, such as selecting and editing a picture (Picture Tools) or a shape (Drawing Tools).
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Custom Tabs and Groups   Lists only custom tabs and groups that you've created.
