Correlation of the magnetic anisotropy, β_A, measured at 0.1r_500c with various halo properties for the z = 0 TNG-Cluster sample. The markers are colored according to CC state. β_A(r = 0.1r_500c) is calculated from a shell with thickness 0.01r_500c. Low values of β_A, corresponding to tangential magnetic field topologies, are found in clusters with (i) high Eddington ratios (upper left), (ii) low central entropy (upper right), (iii) high SMBH accretion rates (lower left), and (iv) high plasma beta, β_P(r = 0.1r_500c), (lower right).