Multiste : Best way to move a subfolder til main

Hi

I have installed the Multisite version with https://www.mydomain.xx/subfolder.

Originally I created the subfolder structure with the purpose of handling multi luangage. I have realised that this is not the best way, why I would like to move the one subfolder content to the main site.

from https://www.mydomain.xx/subfolder
to https://www.mydomain.xx

I have tried with NS cloner but it correputed the menu’s and style settings.