Yesterday the focus view (one sentence at a time, words dissolving as you read) was a macOS-only floating window experiment. It's a real reading mode on both platforms now. On the Mac it floats above the book with its own play/pause control and a wider column so the big type breaks at a comfortable line length, and space toggles playback. On iPhone there's no window to manage at all: turn the phone sideways and the page hands off to the same dissolve focus view, full screen with the chrome gone. It scrolls, follows the spoken word, and rotating back to portrait drops you right where you were.
The point of a focus mode is fewer things to look at, so the fixes were mostly about getting out of the way. The dissolve grains words in faster now, so a sentence is legible before the voice catches up instead of arriving as static. And the focus-lens effect used to bold the current word as the cursor reached it, which nudged the whole line into reflowing; it scales and glows instead, so the text holds still. Small things, but in a mode whose whole job is calm, a line that twitches is the one thing you notice.