I run a multi-monitor setup, technically a ‘second’ monitor attached to my laptop. The launcher can be dragged all over the place on the screen easily enough but if I try to drag it from my laptop display (right, 14") to the 2nd screen (left - 24") the launcher will go freely until the right edge of the window gets to the left edge of the laptop display - then it stops, as if it’s stuck or being pinned and can only move vertically.
I can work around this - sortof - with WIN-SHIFT-LFTARROW to force the app to switch screens. It drops the app into the middle of the screen, but I cannot drag it around at all; the launcher will only move up/down on this secondary screen.
Item of note: I do run the game in full screen mode, not windowed - but that’s the game, not the launcher. The launcher really seems to not like secondary displays as far as freedom to move the window around goes.