Thanks for answering, favoyang!
In general, what you want to change here is called MixDuration
, which can also be described as transition time between animations.
Note that you can also programmatically override the MixDuration via code:
TrackEntry mixDuration
TrackEntry entry = skeletonAnimation.AnimationState.SetAnimation(0, anim, false); // or AddAnimation() respectively
entry.MixDuration = 0;
Note that there will be at least a single transition frame, if you want to get rid of it as well, you can add a call to
[above code]
skeletonAnimation.Update(0);