John,
Unfortunately, the arrows you’re mentioning aren’t actually there for the “add new field group” meta box in the ACF admin, at least with my issue. (They are there on the page/post editing side of things though) Also notable to my issue is that the other meta boxes are draggable from the main content area to the sidebar content area – except for the “add new field group” meta box which appears locked in place.
I also just tested this again, and it appears creating a new user account fixes the issue and the “add new field group” meta box is once again positioned in the main content column/area. So it appears this is somehow tied to the user account, but not sure how/why.
