Validity check to ensure that the properties of our sample galaxies remain unaffected by size biases, (a): Histogram of galaxy sizes in the V-, R-, and I-bands grouped by their parent cluster redshift: ɀ ≈ 0.58, ɀ ≈ 0.70, ɀ ≈ 0.79. Each coloured bar in the plot represents a specific redshift value, with bars of different redshiſts stacked on top of each other, (b): Histogram of galaxy sizes in the V-, R-, and I-bands grouped by their disc colour. Galaxies are classified as ‘Red’ if they are redder, ‘Normal’ if they are comparable, and ‘Blue’ if they are bluer than the field members. Each coloured bar in the plot represents a disc colour category, with bars of different disc colours stacked on top of each other.