Why these apparently non-matching hits?

[terrypin]

Puzzled what my mistake is here please?

[therube]

Match Path is enabled, most likely.

Note the highlighting.
libraries, libraries, & LIBRARIES are highlighted in the Name: column.
So what is being found is OpenSCAD\ (from the Path: column), & libraries (from the Name: column).

[terrypin]

Thanks but same results either way. It was enabled (presumably by default) so suppose I don't really understand its function. With it disabled it still gives the folder hits.

[therube]

Then...

It's going to deal with the \'s.
And whether there is a closing \ or not.

(There is some meaning in there, that I'm sure is noted in the Search help [but as I don't typically care one way or the other, I don't particularly know, offhand ].)

So add a trailing \ to your search.
Or keeping your existing search, you could do something like, parents:>3, which would change the results similarly (but not the same, necessarily).

[terrypin]

Thanks, a trailing'\' fixed it.