Please make the Search function work more like Spotify’s advanced search options (see https://support.spotify.com/us/article/search/).
It would also be nice to be able to limit searches to either your music library (maybe source:ml) or multiple sources (source:ml,spotify,amazon) or exclude a source (source:-spotify).
To reduce typing maybe have abbreviations for the different options (src for source, art for artist, trk for track, etc.).
Allowing keyword searches like this would keep the search interface clean but allow even more advanced search options than we had in the previous version of the Sonos app.