Reassign several folders at once?

Hi,

I moved several foldes with DNG files into one subfolder (folder by folder, not all files into one folder) online by using OneDrive and not within Lightroom oder with Windows Explorer to avoid a re-upload of several gigabytes.

How can I reassign the subfolders in Lightroom at once? If a select several subfolders (in my test case 2 of them) and select "search missing folder" ...

... I get this message:

What does this mean? Afterwards all files are in one single folder? Or will Lightroom assign the two  selected folders to the both subfolders correctly?

Thanks!

mycc