Is it still possible to control the rate of fitness decay?

Before the GUI revisions I was able to set rate of decay. For my current base phase I don’t want it to fall as I do endurance workouts, so I set it to not decay. I can’t seem to find that anymore. Has it been removed, or am I just missing it somewhere?
Thanks

Account Settings/Profile/XPMC Settings/Signature Decay Method.

Thanks!