1. Question: Why can’t the shamash on a menorah which is less than ten tefachim which is about 35 inches from the ground be lower than the rest of the lights?
A. The shamash is used to light the Chanukah lights and is the extra candle to benefit from because you can’t get benefit from the Chanukah lights which are set aside to remind us of the miracle.
B. The shamash can be higher, lower, set apart or in front or in back of the rest, anything to show that it’s not part of the mitzvah lights.
Answer: Below ten tefachim is so low that it’s not really usable as light so it can’t be used as a shamash. (See Dirshu Mishna Berura 673:1:20:25)