What setting must be activated to prevent swaps on past dated projects?

To prevent swaps on past dated projects, activating the "Restrict Swapping Past Dates" setting is essential. This setting specifically addresses the issue of managing project timelines and ensuring that the integrity of historical data is maintained. When this restriction is in place, it disallows any changes or swaps that would modify previously established project assignments or dates, thus aiding in maintaining accurate records and preventing potential discrepancies that could arise from retroactive changes. This is particularly crucial in professional services environments, where project timelines and resource allocations can have significant financial and operational implications.

While other options may relate to swapping features or modifications, they do not specifically target the concern of restricting actions on past dates, making the chosen setting the most relevant and effective for the intended purpose.