Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/MR_SUBG/AGC_ANA_ENG#0x0
AGC_ANA_ENG register
Select the mode for AGC analog part:
Attenuation at LNA level by step of 6dB with thermometric code:
Attenuation at PGA level by step of 6dB with binary code:
https://github.com/modm-io/cmsis-svd-stm32