Newbie question: organising media

[Beemer]

I use a QNAP NAS, minimserver and WiiM streamer. When I use the WiiM app, e.g. to view Artists list the display always starts at 'A'. This means that I have to scroll through hundreds of lines to get further in the alphabet. (searching for a starting letter does not work) In other words there is no way to select a starting letter to move quickly to other artists. Is this a limitation of minimserver, or of the WiiM app?