Track View > Curve Editor > Curves menu > On/Off
Use On/Off when you want to work with the original function curve rather than a curve altered by ease and multiplier curves.
A disabled curve has no effect on its assigned track, but can be enabled to restore the effect.
To toggle the active state of an ease or multiplier curve:
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In the Hierarchy list, highlight one or more ease or multiplier curves.
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From the Curves menu choose On/Off.
If you also have the parent track selected (the transform that has the ease applied), you will see the difference in the curve
when you turn the ease or multiplier off.