Consider a quadratic differential system featuring a singular point characterized by purely imaginary eigenvalues, signifying a center-focus singularity. The work in reference [1] establishes that the highest multiplicity of the invariant straight line at infinity for this system is three. In this exposition, we employ various methodologies to elucidate the qualitative dynamics of these systems on the Poincar´e disk. Furthermore, we intend to employ these findings to perform a comparative analysis with previously obtained similar results.