Themify - can't extend centre screen

Hi all,
I have an issue with themify (or maybe not themify, maybe something else causing it) I can't get the centre screen to expand all the way to the right. I changed the accordion background colour to black and I see a bar at the top right of the screen - seemingly it's this that is stopping the centre window from spanning all the way to the right. But for the life of me I don't know what this refers too. Any ideas on what I've done wrong?

NVM, I'm an idiot! Forgot I also installed Octoprint-Widescreen plugin!