i dont know where it comes from, however i didnt enable it and the small window shows up and i cant close neither click it.

1x ...eDetails/frames/window_options2_sections.lua:5651: bad argument #1 to 'ipairs' (table expected, got nil)
[string "@Details/frames/window_options2_sections.lua"]:5651: in function Open' [string "@Details/frames/window_options2_sections.lua"]:5668: in function <...eDetails/frames/window_options2_sections.lua:5570> [string "@Details/frames/window_options2_sections.lua"]:5815: in function <...eDetails/frames/window_options2_sections.lua:5814> [string "=[C]"]: in function xpcall'
[string "@Details/Libs/DF/fw.lua"]:3991: in function `CoreDispatch'
[string "@Details/Libs/DF/button.lua"]:706: in function <Details/Libs/DF/button.lua:642>

I have this as well in the Alpha version, minus the error. It did not come up in solo gameplay, until I entered LFR, and stuck around after that. It was movable, but otherwise non interactable.

A reload cleared it.