Hasta La Motion!

I’ve run into a frustrating problem while trying to improve my solution in PFtrack 4.1.

So i’ve solved and want to delete the features that spike into the red in the proj-E graph. But i only want to delete the red parts. but when i select the auto feature and right click the;
Remove From Frame
Remove From Frame+Forwards
Remove From Frame+Backwards
are all grayed out.

I’m sure when i did this in college I was able to delete the auto features from specific frames. I should point out that i can still delete the auto features entirely, but i don’t really want to do that.

i’ve gone over the manual but haven’t found anything.
Am i doing something stupid?

Appreciate any help

Thanks