A Scrum Master is working with a Scrum Team that has Developers in different physical...

The Scrum Master should allow the Developers to self-manage and determine for themselves what to do because:

It respects the autonomy and empowerment of the Developers. The Developers are accountable for organizing and managing their own work, and they are the best people to decide how to conduct their Daily Scrum. The Scrum Master should not impose or dictate how the meeting should be set up or run, as that would undermine the self-organization and collaboration of the Developers.

It supports the continuous improvement and adaptation of the Developers. The Developers are expected to inspect and adapt their process and practices, and to find ways to overcome any challenges or impediments they face. The Scrum Master should not solve the problems for them, but rather facilitate their problem-solving and learning abilities.

It aligns with the role and responsibilities of the Scrum Master. The Scrum Master is responsible for promoting and supporting Scrum, and for helping everyone understand and enact Scrum theory, values, principles, and practices. The Scrum Master is not a manager or a leader of the Developers, but rather a servant-leader who enables them to work effectively.

References:

Scrum Guide 2020, page 6: “Developers are the people in the Scrum Team that are committed to creating any aspect of a usable Increment each Sprint.”

Scrum Guide 2020, page 6: “The Developers are accountable for … organizing and managing their work.”

Scrum Guide 2020, page 12: “The Developers can select whatever structure and techniques they want, as long as their Daily Scrum focuses on progress toward the Sprint Goal and produces an actionable plan for the next day of work. This creates focus and improves self-management.”

Scrum Guide 2020, page 13: “The Daily Scrum is an internal meeting for the Developers. If others are present, the Scrum Master ensures that they do not disrupt the meeting.”

Scrum Guide 2020, page 7: “The Scrum Master is accountable for establishing Scrum as defined in the Scrum Guide. They do this by helping everyone understand Scrum theory and practice, both within the Scrum Team and the organization.”