Annotation clips, go to the fifth icon in the Properties panel. Here you can add an annotation clip when you add it, you can draw shapes in your video. For example, you can add an arrow on your video. If you want it to stay flat, hold the shift button and it will snap to zero degrees 4590 etc. You can adjust the color of positive thickness or the shadow an outline and change how the arrows and points look. You can also add squares for highlighting boxes for example or other features.