Use Frame Horizontal Extents to show only the active time segment, Frame Horizontal Extents Keys to show all keys including those outside the active time segment, and use Frame Horizontal Extents Selected Keys to show only selected keys.
Frame Value Extents adjusts the zoom factor of the Track View Key window vertically so you can see the full height of the curve. Frame Value Extents Range also adjusts the window vertically but it zooms only to the height of the keys currently in view. Frame Value Extents Selected Keys adjusts zooms to display only the curves of the selected keys.
Frame Horizontal and Value Extents combines both horizontal and vertical zoom to display selected keys in their entirety.
To adjust the zoom to a specific extent in the Key window:
The Track View Key window adjusts.
Frame Horizontal Extents
Frame Horizontal Extents Keys
Frame Horizontal Extents Selected Keys
Frame Value Extents
Frame Value Extents Range
Frame Value Extents Selected Keys
Frame Horizontal and Value Extents