Correctly driving dual 7-segment display
add Pin 15 R-EXT to 0V sets the CC per segment

5mA may be adequate or 10mA with a dark red flat film cover for better contrast.

 Output current (mA) 3    5   10  20  50  80 130
 Rext (Ω )        6740 3930 1913 963 386 241 124
  ............................^


With 0.35 RdsOn @ 3.3V and 8 segments ON  @ 10mA or IR=80mA*0.35Ω = 0.028V  , the Anode drop is OK.