When can I make changes to plan details that I'm showcasing for comparison?

Making changes to plans for comparison really depends on when your open enrollment event is scheduled.

If your open enrollment is scheduled to start on November 1, you could make the changes in early October, or make the changes now, but future date them to October 2021 so that your benefits roll out from that time period. Remember that the old details will be overwritten and the participant sees only the new details for the new enrollment.