How can I disenroll all participants from a plan?

Use the Manage Eligibility Profiles task to create an eligibility profile. You can configure it to exclude participants who satisfy the eligibility profile. Then, attach the eligibility profile to the plan.

In the benefits service center, when you process the relevant life event and eligibility is evaluated, all participants will be disenrolled from the plan.

Another way is to configure any life event that is linked with the plan and set the enrollment code to Current - lose only; new - nothing. When you process that life event, all participants will be disenrolled from the plan.