Panels that are decorative sit on each side of your window and remain stationary. You need only to decide how many widths you want on each side of your window.
For windows wider than 60” we recommend 11/2 to 2 width panels on each side of your window.
Use the same rule for windows taller than 90 inches.
If your drapes are functioning proceed to the next step, “Width for Functioning Drapes”
For luxurious panels that look like the ones you see in decor magazines use more than 1 width per side.