Recouple Ranges resizes the range bar so that the beginning and end of the range matches the first and last keys in the track. This is useful to quickly realign the range and the keys after editing.
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Track View > Dope Sheet Introduction > Ranges toolbar > (Recouple Ranges)
Note: The Ranges: Dope Sheet toolbar doesn't appear in Track View by default. To open it, right-click an empty area adjacent to the Dope Sheet toolbar and choose Show Toolbars 
Ranges: Dope Sheet. Then, if you like, save your layout by right-clicking an empty area of the toolbar and choosing Save Layout or Save Layout As.
Ranges: Dope Sheet. Then, if you like, save your layout by right-clicking an empty area of the toolbar and choosing Save Layout or Save Layout As. Procedures
To recouple a range:
- Right-click an empty area adjacent to the Dope Sheet toolbar and choose Show Toolbars Ranges: Dope Sheet.
- On the Track View toolbar, click
(Position Ranges). - Select one or more item labels in the Hierarchy list to select tracks to be recoupled.
- On the Track View toolbar, click (Recouple Ranges).
3ds Max positions the range bars for the selected tracks to match up with the first and last keys in their track.
Position Ranges mode allows you to decouple the range bar from the animation keys. Recouple Ranges is a quick way to realign the range bars.