With the rise of the sixth generation (6G) and the use of frequency range 3 (7.125-24.25 GHz) (FR3) centimeter wave (cmWave) bands, interference-limited environments due to the coexistence of multiple incumbents are becoming increasingly common. This emphasizes the need for effective interference management without sacrificing time and frequency resources. In multi-cell, multi-user scenarios, beam selection is crucial in reducing interference, particularly in non-orthogonal space division multiple access (SDMA) systems. This paper explores interference mitigation for multi-panel user equipment (MPUE) in coexisting FR3 networks with the help of beam selection mechanism. Numerical simulations showcase the gains in spectral efficiency and fairness achieved through this approach.