Answer
K means thousands, M millions, B billions and T trillions, with up to two decimal places. Larger magnitudes use scientific notation. This can apply to numeric axes, bar and pie labels and doughnut totals. Years, dates, category names and legend names stay unchanged. A requested CSV export also keeps the exact values.
Native charts use light backgrounds, with coordinated colors that can vary between requests. Short-category bars can be horizontal or vertical; part-to-whole charts can use a pie or doughnut layout. Styling does not change the data, and retries keep the same theme.
Titles, axis names, categories and legends adjust their text size when needed. Multiword labels can wrap at spaces while individual words stay intact. Different metrics can use separate labelled scales.