In the screenshots posted for the details to grid view converter extension, the small x used to close the details pane on the right is hidden. Now, I've been digging around for like an hour trying to figure out how to hide that as well, and I'm starting to lose it haha. I'm using the harmony theme by the way. From what little I know, I believe UI elements are controlled by the themes? So, I thought there would be an option in there with the theme modifier extension, but no luck.
So yeah, pretty trivial issue haha.