I can't pinch zoom or zoom out the time navigator by trackpad(Mac, after effects 2017)

[hahiho]

I used after effects 2016 and recently I upgraded to 2017.

I can see a lttle difference, still it's good. comfortable.

But I can't use my trackpad pinch zoom for the time navigator(time ruler)

before, I used my pinch zoom a lot for shrink and expand the time ruler.

Fortunately I can still use the alt(option)+two finger scroll up/down for the time ruler control, but I want to know why the trackpad pinch zoom doesn't work.

Is it a kind of some bug or error? or deleted function?

Thank you for reading..