Hello There,
Thanks for writing in! By default, the animation loop is set to true. There isn’t an option where can set it to false in Cornerstone. It could be possible with custom development, but this would be outside the scope of support we can offer. You may wish to consult a developer to assist you with this.
This is something we can add to our list of feature requests. This way it can be taken into consideration for future development. All of these items are discussed with our team internally and prioritized based on the amount of interest a particular feature might receive.
Thanks for understanding. Take care!