From sdgs.un.org/goals

From https://www.un.org/en/model-united-nations/introduction

The Chair acts as a representative of the entire Committee, and their actions must be acceptable to it. That support is likely to be forthcoming, as long as the Chair reflects a good understanding of the wishes of delegations.

In some Model UN conferences, the Chair plays mostly a procedural role, and the substantive role is overlooked. Emphasizing the substantive role of this key leadership position in Model UN conferences can greatly enhance the negotiation process, and lead to more decisions being adopted by consensus.

From https://www.un.org/en/model-united-nations/substantive-role-chair