Steam overlay only appearing in bottom left quarter of screen

Does anyone know how to fix the steam overlay only appearing in the bottom left quarter of the screen - problem only occurs on FM18, steam overlay is responding. playing on Mac

I had a quick look but have no idea how you have managed to do that! I'm guessing you can easily minimize it though?

I can open and close the overlay, so it isn't stuck there. Though I can't open it to full screen, really annoying! The overlay is still responding but the buttons are responding to where they'd usually be in full screen - so for example if you look at the screenshot attached to the OP - View discussions will open if I click where Denmark is on available jobs. It opens in the bottom corner also.