What is the Church in relation to Christ according to Ephesians 1?

The Church is Christ's body. God has given Christ to be head over all things to the Church, and the Church is described as His fullness, the complement and completion of Him who fills all in all. Believers—you and I—constitute this body.

Les explains that God has given Christ to be head over all things to the Church. The Church is His body—you and I. Les points out that this body is called the fullness, the complement, the completion of Him that filleth all in all. He connects this to Christ's total dominion: He is far above all principality, power, might, dominion, and every name named, not only in this world but also in that which is to come, with all things put under His feet.

Ephesians 1:23

Which is his body, the fulness of him that filleth all in all.

What does Ephesians 1:22-23 say God gave Christ to be over the church?

Ephesians 1:22-23 says God put all things under Christ's feet and gave Him to be the Head over all things to the church, which is His Body, the fullness of Him that filleth all anon. The church is the Ecclesia, now the Body of Christ.