Hello @DanielH, you are correct, at the moment this is not possible. When the functionality to freeze columns was added to QuickSight, it was only added for the standard table visual. This is the blog post that was released a few months ago when they released this update to provide you with some more information.
At AWS, our roadmap is primarily driven by our customers. Your feedback helps us build a
better service. Since this functionality is currently not included, I have tagged this as a feature request. Let me know if you have a follow-up question, otherwise I will archive this topic for the QuickSight team. Thank you!
Hello @DanielH, since I have not heard back for any follow up questions, I will go ahead and archive this feature-request topic for our Service Team. Thank you!