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So I will try to explain this again.

The New ZL interface lets you program 3 different groups of any levels that you like.
Each group CAN have 3 levels in it and each level CAN have different sub-levels that you can easily switch to too.

But you could just program all 3 levels in a group to the same level and not let them know about the sub-levels at all.

Each group considers one of 3 button press actions as calling for a specific level that you can program.

So you can make the single press,press and hold and double press all the same level and then the light will act like a single level light at whatever level you want.

You could also make a 2 level light by making the single press one level and the double press and press & hold the same 2nd level.

The flexibility of the UI is pretty amazing and different than most others and can allow for some unusual options for sure.

Also the Streamlight 10 Tap program can be 1 or 2 levels if you want and they have a newer right angle light that has that interface too.