Can't Move In-Game Addon

Hello. My in-game addon is unable to be moved/dragged and the entire window is unable to be seen. Is there a way to center the addon window or reset it to it’s default position? This occurred as soon as I began using a new ultra-wide monitor. I’ve tried reinstalling the addon and also disabling all other addons.

Use /amr reset to get the window back to the centre of the screen.