Since the floor, ceiling, and number of steps can be whatever you want, it spaces the middle modes evenly on a visually-linear scale. Or as close as it can get, at least, from the 150 available levels.
With just 2 steps, you’ll get just the floor and the ceiling. Nothing between. Modes are low, high, and maybe turbo.
I say “maybe turbo” because it depends on where the ceiling is configured. If the ceiling is set to 150 (one click), there is no separate turbo.
With 3 steps, it’ll be floor, ceiling, and halfway between on the ramp. So it’d do low, med, high, and maybe turbo.
Or to set it up for steps of 25, 50, 75, 100, 125, and 150… Do 25 clicks for floor, 26 clicks for ceiling, and 5 steps. Five regular output levels plus turbo.
If you tell it to use just 1 step, it’ll get a little confused and act like you configured it for 2 steps instead. But you can still make it a one-mode light by setting the floor and ceiling to the same number, I think. Unless it divides by zero. That’s a possibility. Probably should have tested that.
For use as a 1-mode light, I’d recommend just using momentary/tactical mode.