Impact on the steady-state MRI-driven accretion when varying the maximum grain size, a_dist,Max, of the fixed power-law dust size distribution (Model I). Going from solid light-colored to dark-colored lines, a_dist,Max spans the range from 1 µm to 1 cm. The panels show the steady-state radial profiles of several key quantities (see also Delage et al. 2022, for their definition), for the model parameters M_⋆ = 1 M_⊙, L_⋆ = 2 L_⊙, M_disk = 0.05 M_⋆, f_dg,tot = 10⁻², α_hydro = 10⁻⁴, a_min = 0.1 µm, and p_dist,Exp = −3.5. Panel a: pressure-weighted vertically integrated turbulent parameter, . Panel b: gas surface density, Σ_gas. Panel c: midplane total ionization rate, ζ. Panel d: midplane optimal rms magnetic field strength, B. Panel e: (constant) gas accretion rate, . Panel f : midplane radial dead zone outer edge location, R_DZ. For comparison, the dashed gray and black lines in panel a display the steady-state quantity obtained assuming the limiting case of a mono-disperse population of dust with size a_mono = 0.1 µm and a_mono = 1 cm (equivalent to the grain-free scenario), respectively.