Which bar types are available?
Beyond time bars: range (a bar per N ticks of travel), volume (per N contracts), trade (per N prints), delta (per N contracts of imbalance), vol bars (travel then pull-back) and renko. All are built from raw stored ticks rather than resampled from minute data — a range bar resampled from one-minute data cannot know where inside that minute the range completed, so its opens and closes are wrong.
Pick one from the chart-type menu, type its size once, and the interval box becomes the size box — changing a 40-tick range chart to 60 is typing where it says RANGE. Picking any candle type takes you back to time bars.