"Only on repeat" is an Animation setting that allows you to disable animations of the last loop of your creative. This feature is great for having certain text elements or graphical elements not appear on the last run or creating an outro for your design.
The easy steps are:
Add your animation such as opacity, move, etc.
Go into your right-hand menu
Click on "only on repeat"
....And boom, you're done 🎉
More of a visual learner, too. Therefore I have made a short video showing the magic:
Happy animating 🌟