Can't move preview to 2nd screen

[CortJstr]

I can't find a way to move my preview image to a second screen. When I try to drag it the window stops at the edge of my primary monitor. Is it because Windows thinks the window is always "maximized?"

I've been using FastPreview since PicaView stopped being available but this is my first time installing it on a multi-screen setup so maybe it's just me.