Way to show your other animation inputs when recording over previous animation

I would expect a program like this to have such a function. For example, if I move the right arm in the first recording, I expect it to show up when recording over to animate the left arm. Right now, it's just guesswork on when I moved the right arm, which is wasting a lot of time trying to sync up the two arms to have precise timing. Am I missing this feature, or is Character Animator missing some of the more obvious features that should already be implemented in the program?