You can choose more than just two font sizes.
Hence, copying and pasting a \box that is already set to smaller font size maintains the small font size. Using Copy & Paste to copy the \box character (U+25A1) also copies information on the font size. You can type \box\sqrt(x) followed by Space, ←, Context, D, and it’ll reduce the font size of the entire square-root. You can use \box to reduce the font size of anything, not just fractions. This finding has several interesting corollaries: Press the → (right arrow) key to restore the cursor position and continue typing. This command is not available if just one argument is highlighted in gray. Press the Context key followed by D (“Decrease Argument Size”). (With the “normal” fraction, the Left Arrow key instead navigates directly into the denominator.) This indicates that \box has inserted an extra element (and then a normal fraction inside of it). This brings the cursor into a position where the entire fraction is highlighted in gray. The fraction is inserted and looks “large” at first. Turns out that \box does insert something special, albeit something that defaults to the normal font size, but it has a feature which enables the following sequence of keypresses to make it small:
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