The filter buttons on the Track Selection toolbar help you control which tracks are displayed in the Controller (Hierarchy) window.
You can use any combination of these filters to control what you see in Track View.
Interface

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Filter - Selected Tracks Toggle
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When on, the Controller window shows only selected tracks.
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Filter - Selected Objects Toggle
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When on, the Controller window shows only tracks for selected objects.
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Filter - Animated Tracks Toggle
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When on, the Controller window shows only tracks with animation.
Filter - Active Layer Toggle
- When on, the Controller window shows only tracks in the active layer.
Filter - Keyable Tracks Toggle
- When on, the Controller window shows only keyable tracks.
Filter - Visible Objects Toggle
- When on, the Controller window shows only tracks containing visible objects.
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Filter - Unlocked Attributes Toggle
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When on, the Controller window shows only tracks whose attributes are not locked.