Yes, and there is a separate course written specifically for them.
The 15-minute course on this page is for everyone: employees, contractors and volunteers. Supervisors and managers carry an additional duty. They must act on their employer's behalf to identify, address and resolve conflict, and they need to understand how a complaint is properly investigated. That is a different job, so it is a different course.
Sentrient's Conflict Resolution Training Course for Managers is a 15-minute online course covering a manager's duty to address and resolve conflict, how to identify and respond to conflict-related concerns, how to handle conflict effectively, and how an employer investigates a complaint. Managers complete a short assessment and receive a Certificate of Completion. Like this course, it is written together with Mills Oakley Law Firm in Australia and Simpson Grierson in New Zealand and is kept current for every state and territory.
Most organisations roll out both: the employee course to everyone, and the manager course to anyone with people reporting to them.