Two buttons removed from later versions?

While I was looking through some screenshots and videos of older versions of OpenShot, I noticed that the older versions had two extra buttons on the preview panel. These buttons are not present in later versions. I might be mistaken, but, to me, these look like buttons to set the in-point and out-point of the video clip so that you can just bring a small clip of the file onto the timeline. Given the kind of videos I'm trying to make with OpenShot, this sort of feature would be incredibly useful. I was wondering why these two buttons were removed from later versions of OpenShot.