An open card's title and Close stay at the top while you scroll a long card. Escape, or a click outside the card, closes it too. When you open the card again in the same browser, it opens where you stopped scrolling, and the board's address names the open card.
A card's title, description, column, assignee and due date are edited where they are shown and save on their own, with no Edit card details form. Choosing another column moves the card there. + Add a card asks only for a title and then opens the new card.
A board shows its name, description and who can see it above its columns. Its name, description and outside access change from Edit details in its More menu, which also has Import JSON and Delete board; there is no separate settings page. Column names are renamed by selecting them, and New board asks only for a name.