I have 2 suggestions I'd like to propose.
1. An option to auto hide the categories when moving between categories.
2. User chosen folders instead of Music Documents etc.
New: MBox Viewer (Mar 22, 2026), Platform 30.3 (Mar 29, 2026)
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Both are planned for an upcoming release: See the "Upcoming Features" section here: https://portableapps.com/node/28593