Rashi on Exodus 26:9/רש"י על שמות כ״ו:ט׳

1וכפלת את היריעה הששית AND THOU SHALT DOUBLE THE SIXTH CURTAIN which was additional in these upper curtains over and above the lower curtains,

2אל מול פני האהל OPPOSITE THE FRONT OF THE TENT; half of its breadth (two cubits) hung down, being doubled, over the screen which was on the east side before the entrance, whereby the Tabernacle gained the appearance of a modest bride who has her face covered by a veil.