Projected G shown in the 5th row of Monitor Sheet is the norm of the projected gradient vector of G or A of the system. The projection is made into the space which satisfies mass-balance equation. The smaller Projected G is, the more precise the solution is. If projected G < 1E-3, you can rely on the solution as good enough.
Since the calculation algorithm does not use this projected G as a criterion of convergence for saving time, this value confirms the convergence.
Also you can see the Projected G in the 3rd row of Results Sheet by clicking the leftist column of the row.