The correct statement about the Proof of the Pythagorean Theorem is:
To make a right triangle in the center, the area of the smaller two squares must add to equal the area of the largest square.
This reflects the essence of the Pythagorean Theorem, which states that in a right triangle, the sum of the areas of the squares built on the two shorter sides (legs) equals the area of the square built on the longest side (hypotenuse).