Thumbnails are not sorted when adding new albums

[Rayco_46]

Hi everyone,
When I add new albums in my library folder, new thumbnails appears at the end of the thumbnails list. For example in the attached screenshot, I've just added two new albums of the first band (called "3"). The two new thumbnails didn't appear at the right place, but at the end of the list (12K albums farther !).
I tried different settings in the grouping options, but nothing works. For now I set "group by artist", but I tried several others .
The only way that works is to delete library database and scan it again each time I add new albums. But it takes two days (140K files...).
How could I do to fix the problem ?
Thanks !

[Artem]

Click at column header to sort the list at specified criteria

[Rayco_46]

Thanks Artem, I forgot to add "artist" column in the library window, as artists were shown in browser on the left side.
So I just added the artist column and...that works !
Great ;-)