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Seventy three words start with UN, and the fourth box carries far more information than the third.
C takes the third box in seven of the seventy three, with D, L, A, B, G and I on six or fewer. Eighteen letters appear there, so that box is close to useless.
The fourth box is the opposite. I takes twenty words, E takes nineteen and A takes thirteen, which is fifty two of the page from three letters and only ten letters appearing in total.
UNDER, UNITE, UNITY, UNION and UNFIT are the entries a puzzle is most likely to want, with UNCLE, UNIFY and UNDUE behind them.
UNIFY, UNION, UNITE, UNITS and UNITY all sit on it and every one is an ordinary word, which no other branch here manages.
Everything else is the prefix bolted to a short stem. UNBAG, UNBAR, UNBED, UNBID, UNBOX, UNCAP, UNCUT and UNGAG are valid entries that nobody would guess, and they are what inflates the count.
T closes thirteen of the seventy three, eighteen percent, and D takes twelve, which reflects how many entries are past tense forms of the prefix.
Only one word on the whole page repeats a letter, so a visible double rules almost everything out at once.
The fourth box. I, E and A take fifty two of the seventy three between them, while the third box spreads across eighteen letters.
UN attaches freely to short verbs, producing valid entries like UNBAG and UNCAP that nobody would reach for. They pad the count without adding options.
One. That is the lowest share of any page this size, so a double is a decisive signal here.