def METHOD_NAME(fields=None):
    files = status['allfiles']
    keys = set()
    for f in files:
        keys = keys.union(f.usertags)
    if fields is None:
        fields = load_fields()
    for f in fields:
        if f in keys:
            keys.remove(f)
    data = [(k, k) for k in fields + sorted(keys, key=natural_sort_key)]
    tb = status['table']
    tb.model().setHeader(data)
    hd = TableHeader(Qt.Orientation.Horizontal)
    tb.setHorizontalHeader(hd)
    hd.show()