Size–mass relation of BGGs classified using the consensus (color+sSFR) method, shown here for the redshift bin z = 0.5−1.0. Blue circles represent star-forming BGGs, and red hexagons show quiescent BGGs. Solid and dashed lines indicate best-fit power-law relations for QGs and SFGs, respectively, with shaded bands showing the 1σ uncertainties. Dash-dotted cyan and dotted orange lines show comparison relations from Faisst et al. 2017, while dashed lime and magenta lines show results from van der Wel et al. 2014. Vertical and horizontal gray lines mark the stellar mass limit of log₁₀ (M_∗/M_⊙) > 10 and size cut of R_e > 0.5 kpc, which are applied when fitting the relations. While BGGs follow similar evolutionary trends, they tend to be slightly smaller at fixed mass-particularly among quiescent centrals-highlighting the influence of group environments on galaxy structure. The size–mass relations for all other redshift bins are available in Section 6.