For the rod pocket style and the magic tape style, the default is flat. If you need pleats, simply buy 1.5 to 2 times the rod length for the rod pocket style. For the magic tape style, do the same—buy 1.5 to 2 times the length and then directly apply the pleats with the tape.
The yellow lines in the image represent the four common height specifications: 40 cm, 58 cm, 90 cm, and 120 cm.