Spanning Dark Souls Window Across Monitors

[Zinthros]

Essentially, whatever I try with a present & render resolution of 5760x1080, windowed Dark Souls refuses to make the window this size despite rendering properly in that resolution, leading to a compressed view with slenderman-style characters. Is there any way at all to run the windowed Dark Souls in this resolution? Tried borderless windowed mode and regular windowed mode, neither seems to work. Running latest DSFix with Widescreen Fixer to hook in and prevent the black screen on startup w/ that resolution. Tried the "span across monitors" hotkey in DisplayFusion Pro as well with no results.