I've covered that above.
The miscellaneous files category shown when you click on Storage is just that. A collection of different miscellaneous files in different locations on your device. You won't find a Misc folder. There isn't one. Those categories within the Storage area are just that, categories of files found on your internal storage.
The SD Card Analysis tool will show you where big files/folders are, you may need to expand the Tools menu and turn on Show Hidden Files to see them all, not sure if the search respects that option or not.