Size distribution of the Lupus disks. Disks exhibiting substructures in the continuum images are shown in dark blue, while smooth disks without visible substructures are depicted in red and added on top of the blue histogram. The pie charts inside the plot show the percentages of disks with and without substructures for sizes above and below 30 au. The vertical dashed orange line indicates our resolution limit, which is set at 0.03″ (4 au). More than 67% of the sample belongs to the compact disks classification.