Question: How can a ten come under the rule of one?

Answer: First and foremost you need to unite among yourselves and become like one person with one heart. Then you will be able to approach the Creator and see how similar or different you are.

Question: We gather together, seem to unite, work together, and raise a prayer. What does it mean that we come under the authority of one?

Answer: By annulling yourselves before each other, you become equal with the Creator and cling to Him. By nullifying your desire to receive, your egoism, in relation to Him, you become one.
[331600]
From the 4th part of the Daily Kabbalah Lesson 7/8/24, “Equal as one: There is no strong friend, there is a strong society”

Related Material:
Under the Authority of the Creator
A Spiritual Orientation Toward The Creator
Annulment Is The Condition For Revelation Of The Creator