Hi, thanks for your questions. I've used a Wave Heading on the curtains (sometimes called a Surf Heading). It's great with bi-folds and large windows with restricted wall space, as the curtains have a very small stack back, which helps maximise light into the room. When the curtains are pulled they keep the wave effect, giving a nice contemporary look. These bi-folds were 5m long and the curtains only took up 50cm either side. You need a curtain track that is suitable for a Wave Heading. Hope this helps.

Thank you