When designing short UI animation it loops like crazy regardless of clip's loop time settings when I pressed the play button. I have been adding a dummy keyframe far back to let it stay still to work, but it was very error prone and I often forgot to remove it. (It affects logic which wait on animation time) There must be something I overlooked. I mean, I just recently know about "F" key fitting the keyframes for about 5-6 years of using Unity. Ideally I would like to press some key on the keyboard and it previews once.