MAX32625PICO SPI Format other than 8bit

Is it possible to use the SPI other than 8 Bit transmission?

I’m trying to use SPI on the MAX32625PICO board.
It works when it is the default setting, but it’s stuck somewhere with Red LED if the Number of bits per frame is changed, such as spim.format(16,3), spim.format(12,3) or spim.format(4,3).
How can we use the SPI more or less 8-bits transmission?