Shaping the eyebrows by trimming, shaving, or plucking for beauty purposes is generally considered haram, as it involves changing the creation of Allah and following Shaytaan’s temptation. However, if the eyebrows grow too long, cover the eyes, or cause distress, it is permitted to trim the excess hair to return them to a normal size.

And Allah knows best.

Sources:

• IslamQA
• Daruliftaa