Ask the gods for guidance. How does the software input an octave with four notes? There is only one horizontal line with four notes on it?
Enter three or four notes in the bar line first, then press the special symbol in the hidden typing keyboard. After pressing any text (a) button in Yale, press the special symbol horizontal line in the typing keyboard (the thickness can be adjusted by itself). Then, after exiting any text key of Yala, use the mouse to move the horizontal line to the bottom of three notes or four notes to cover the broken line.