Hide/Show Non-Selected Curves
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Track View Curve Editor Display menu Hide Non-Selected Curves or Show Non-Selected Curves

These commands either hide or show function curves that are not selected in the controller window.

When Hide Non-Selected Curves is on (the default), the curve will disappear when another track is chosen.

When Show Non-Selected Curves is on, the curve will still be visible in the Key window when another track is chosen.

If you turn on Show Non-Selected Curves, then you can also use Freeze Non-Selected Curves. This allows you to see the other curve but not edit it inadvertently.