So I've been having this issue since I formated my pc and it's driving me a bit crazy. I have some specific applications that I keep open on my secondary monitor so the primary stays clean, but for some reason two of them won't disappear from the primary displays taskbar. Those two are the My Phone app and the Bluetooth Audio Reveiver app. I'll leave a screenshot of this in case it helps. And just in case I don't have any of these aplications pinned in the primary monitor