It seems that when in "Tracks" view, you cannot filter on certain items like Genre. There are many types of albums such as Mixes, Soundtracks, etc that have tracks with multiple genres.
This also causes an issue/bug with synchronization. Since genre is interpreted on an album level, filtering by genre in album view and then synchronizing the results ends up synchronizing all content on all albums where the first song added matches that genre.
This request is to standardize music metadata filtering the same way all other music players function, which is by interpreting the metadata at a track level.