When you select any object and drag it beyond your canvas’ border, the canvas starts to scroll to follow you. For some reason this does NOT work when you drag a comment. So it is sometimes a bit painful to move a comment to a far away place.
Thanks for your feedback! It appears to be a feature limitation at the moment. Let me change the category to “Share an Idea” as a feature request so others can upvote it for future enhancements.
Thanks,
Toku