Mass and size evolution of discs and bulges. Galactic winds model variations (top) and quasar BH physics model variations (bottom). The last column shows the original TNG50. Solid lines and shaded regions represent median values and the 20^th to 80^th percentile distribution. Thinner lines correspond to the evolution of each galaxy. Vertical solid lines denote bar formation median redshift, and shaded regions its scatter. Arrows with small vertical lines correspond to the median redshift formation of the disc/bulge ($z_{50,\mathrm{disc}}$/z_b) and its scatter. Stronger SN feedback delays disc buildup and makes discs more extended.