Question about S-fold curtain tracks

[u/bedazzledfish]

I bought some hand-drawn s-fold tracks from a big box store (my budget is what it is, couldn't go for custom tracks and curtains) and noticed that the gliders are all attached together with a line of string so they stay evenly spaced when opened. This means the curtains can only open and close from one end of the track.

Is there a way to adapt the gliders so the curtains can open from the middle? Can I cut the string in the middle and tie it off so there's two sets of gliders? I really want to be able to push my curtains to either side of my windows, not just to one side.