Redshift evolution of the derived effective radii at two different wavelengths of our sample. The dashed line represents the redshift at which the Y band starts to probe the restframe UV (left). Hexagons show the binned sample of 17 galaxies from Buat et al. (2019) around z ∼ 2, taken from Elbaz et al. (2018) and Dunlop et al. (2017). Empty hexagons show the rest-frame UV radii while the filled ones show the ALMA detection. The dashed line shows the minimal size that can be measured with ALMA (Gómez-Guijarro et al. 2022). The evolution of R_e(UV)/R_e(ALMA) ratio with redshift in our sample of DSFGs is shown on the right.