Top panel: Stellar mass enclosed within 1 kpc of galaxy centre (M_{*, < 1}) as a function of total stellar mass (M_*), coloured according to the central black-hole mass. In the dwarf regime, most galaxies do not harbour a central massive black hole due to the seeding procedure of TNG50, and we identify them with grey crosses. The dashed grey lines show the 1:1 and 1:10 ratios, indicating that low-mass galaxies have most of their stellar mass enclosed within 1 kpc, while at higher masses the inner region represents roughly 0.1–0.2 of the total mass. Bottom panel: Galaxy morphology parameter κ_rot as function of enclosed stellar-mass fraction, f_{*, < 1}, coloured according to total stellar mass. The solid black lines and shaded regions indicate the median and the 25th-75th percentiles. At low stellar masses (redder colours), the inner regions become more dominant. Rotational support is anti-correlated with the fraction of stellar mass in the inner regions.