Dear Eric,
for setting the desired g range please refer to the Table 141 in the FXLS9xxxx datasheet. To set the desired g range, you need to set the U_SNS_SHIFT bits in the CH0_CFG_U1 register and the U_SNS_MULT bits in the CH0_CFG_U2, and CH01_CFG_U2 register. For the FXLS90322 please refer to the Medium g part of the Table 141.
With Best Regards,
Jozef