Maybe someone who actually knows stuff can provide a better reply, I think its about alignment of structures we see in the CMB.
From one of our papers:
"We also find that the local web environment around galaxies of Milky Way's and Andromeda's masses that are near the centre of a cosmic wall does not appear to have any effect on the properties of those galaxies’ dark matter haloes except on their orientation, although we find that it is rather rare to have such massive haloes near the centre of a relatively small cosmic wall."
link to paper: https://academic.oup.com/mnras/article/483/2/2101/5203631