It allows editors at the article level to blacklist various fields so that they do not display. This makes a positive statement that those fields are unsuitable for inclusion in that article's infobox.
Chiàn-cheng kap Hô-pêng, Anna Karenina, A Confession, 天國在你們心中, 什麼是藝術？, Boyhood, Childhood, 哈吉•穆拉特, 克萊采奏鳴曲, 復活, The Snowstorm, 哪裡有愛，哪裡就有上帝, Youth, Father Sergius, Sebastopol Sketches, The Fruits of Enlightenment, What is my faith
Sergey Tolstoy, Tatyana Sukhotina-Tolstaya, Ilya Tolstoy, Lev Lvovich Tolstoy, 亞歷山德拉·托爾斯泰婭, Maria L'vovna Tolstaya, Andrey Tolstoy, Mikhail Tolstoy
and you should get a Wikidata-filled infobox! (Providing the article is linked to a Wikidata entry containing relevant information!). This will by default only fetch information that is sourced on Wikidata. This is an important safeguard for BLPs. The subject's current age (or age at death) will be calculated automatically provided that the dates are sourced and full (i.e. 12 January 1958 not 1958).
This will prevent the infobox from displaying the fields for occupation or children. |noicon=on will suppress the pencil icons in favour of a single "edit on Wikidata" link at the bottom (see Tolstoy, right).