That is the whole settings screen. Everything else about how this reads has been decided, and the decisions are listed at the foot of this page so you can see what they were.
Size
Five steps, shown as five rules. There are no point sizes because a point size is a fact about a font file and not about how far away your eyes are.
Warmth
Moves the ground and the text together so the contrast ratio does not change. In dark mode the ground stops at a warm dim rather than going to black, because white text on near-black haloes for a great many readers.
She had come for a fortnight and had stayed for the winter. This was not a decision anyone had made, and by the time the frost came the question had become the sort that is rude to ask.
Decided and not offered: the measure, at 66ch; the typeface, Crimson Pro; justification, off; hyphenation, on; paragraph indent, one em; space between paragraphs, none; page turns, instant.