Projected magnetic field orientations, derived from polarized emission (line lengths are proportional to fractional polarization values), are overlaid on the intensity color map (using the same color-scale range as Fig. 8). The resulting distribution closely mirrors the broad-scale magnetic field structure seen in the 3D volume-rendered maps (Fig. B.1). The evolution from an initially toroidal field configuration (at injection) to a helicoidal and subsequently poloidal structure is particularly evident along the jet spine. This field is further compressed at the hotspot regions, a feature that is especially pronounced in the high-magnetization cases (top panel). Within the cocoon and secondary structures, the magnetic field appears to broadly align with the underlying flow patterns (e.g., Black et al. 1992; Baghel et al. 2023).