After many searches to find how listen my local library, I found the good action : very simple but, obviously, once we find it !
I stop fumbling and I read the informations (very little characters ; thank you for the presbytes !) et I note that
I can resize the Navigator
ans see all my files with all folders ans subfolders finally !!! and above all, of course, listen to my music stored on my internal hard drive.
So I did well to give the new Audirvana a chance by buying it before my manipulations.
The sound, indeed seems more airy and dense (I’m in the test, so to refine)
A real concern now resolved