@mncroc I think I see the issue--there are two different search boxes, and the minus sign works in one of them but not the other.
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@mncroc
Do you know when / how the duplicates occurred?
If you used the organize feature prior to 1.0.23, it might be caused by a bug that is fixed in 1.0.23, but the duplicated are not removed automatically.
To manually remove duplicates, see.: https://wiki.strawberrymusicplayer.org/wiki/Find_and_delete_duplicates_from_the_collection_database
I suggest to make a backup of the database file (~/.local/share/strawberry/strawberry/strawberry.db) before attempting to modify it.