Single leaf curling up. Help?

Hey mate, First of all your plant looks healthy. since it is a single leaf i would simply ignore it. Tacoing leaves normally means that your light is too intense and the leaves try to lower the intake surface, but thats definetly not the case here, since its only one leaf. Probably grew like that, because of space problems or the stem/leaf could be slightly damaged on that side. Nothing i would worry about or give attention too. You can LST the top of your plant or bend the leaf covering your plant to the side, the big upper leaf pointing towards us. So your branches get sunlight. The top has to be bend down frequently or she grows straight up again like on your picture and shadows all branches to a point where your lst becomes useless. Happy Growing 👍