Bulge-to-disc mass fractions as a function of bulge-to-disc size ratios. Left to right, galactic wind models (top Fig) and BH physics model variations (bottom Fig) are shown. The colour code represents the redshift. Horizontal grey dashed lines represent the limit given by Kataria & Das (2018) for dense bulges that do not favour the formation of a bar, even if the disc could be unstable. Galaxies in the NW model present a large and compact bulge since early times, preventing the disc from forming a bar.