The Curves toolbar provides controls for managing key selection and editing.
Curves: Track View. Interface
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Lock Selection -
Locks the key selection. Once you have created a selection, turn this on and you can't inadvertently select something else. See Lock Selection.
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Snap Frames -
Restricts key movement to frames. Keys that are moved will always snap to frames when this is on. When this is off, you can move a key so it falls between frames and becomes a sub-frame key. Default=on. See Snap Frames.
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Parameter Out-of-Range Curves -
Use this to repeat keyframed motion beyond the range of the keys. Includes options for Loop, Ping Pong, Cycle, or Repeat relatively, as well as constant and linear. If you use Parameter Out-of-Range types, you can later create keys using Track View
Utilities Create Out-of-Range Keys. See Parameter Curves Out-of-Range Types and Create Out of Range Keys Utility. -
Show Keyable Icons -
Displays an icon that defines a track as keyable or not. Use this to set keys only on the tracks you want to keyframe. Turning off a track in Track View also restricts the movement in the viewport. Red keys indicate keyable tracks, black keys are not keyable. See Show Keyable Icons.
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View All Tangents -
Hides or displays all tangent handles on the curves. Use this to hide the handles quickly when many keys are selected. See View All Tangents.
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Show Tangents -
Hides or displays tangent handles on the curves. Use this to hide the handles on individual curves. See Editing Key Tangents.
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Lock Tangents -
Locks the selection of multiple tangent handles, so you can then manipulate several handles at once. When Lock Tangents is off, you can only manipulate one key tangency at a time. See Lock Tangents.