Micro:bit driver expansion board (V2.0) & servo SG92R

Hi all, I am new to servo and micro:bit. I have a dfrobot driver expansion board and a Micro servo SG92R and I programmed them in MakeCode. For some reason, if I connect SG92R to servo interface in the board, and set "servo s1 degree 45" in MakeCode, it turns like 90 degrees. But if I set "servo s1 degree 90", it wont turn at all. However if I connect the SG92R to micro:bit I/O interface, it can turn 180 degrees.
So I have two questions,
Does it mean SG92R or any other servos can turn at most 90 degrees if it is connected to the servo interface? and
what is the relationship between the servo turning angle and the degree shows in the "servo s1 degree" command?
thanks!