You can’t have a vertical taskbar in Windows 11, which is a travesty

If you got the letter, your ISP must have linked the IP to you. That’s how these things work: rights holders tell the ISP that they have proof that someone from Ip address X uploaded their material on date Y, and then the ISP matches that up to a customer.

Without the ISP involved, the rights holder has no way of matching an IP to an identity