Possible not to use normalized root motion scale?

Hi all, I am using root motion animation for my character. I have a set of animations that are shared with two same meshes, one is big, the other is small (60% of the big one).
Now the small one has foot slide problem.
I wonder if there is a way to scale down my animation transform positions to fit the small mesh character?

I saw there is a ‘Use Normalized Root Motion Scale’ option in the Root Motion tab, but I failed to find out how to change the root motion scale.
Anyone can help?

Thank you in advance!