Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb/STM32WB55_CM4/PWR/CR5#0x0
Power control register 5
SMPS step-down converter voltage output scaling
SMPS step-down converter supply startup current selection
BORH configuration selection
Enable SMPS step-down converter SMPS mode enabled
https://github.com/modm-io/cmsis-svd-stm32