Where is my Curve Index drop down?

[Binyamin_Bass]

Why is there no little arrow to drop down the curve index? I want to set the min and max values for distance traveled.

The arrow underneath is for scale color and alpha.

[Michael.Galetzka (MGaletzka)]

[Binyamin_Bass]

That just brings up other options besides distance traveled. However, in the meantime, I figured it out: I needed to first select normalize float, and afterwards, under that, choose distance traveled.

Thanks for helping.