Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32g0/STM32G031/ADC/CCR#0x0
ADC common control register
ADC prescaler
VREFINT enable
Temperature sensor enable
VBAT enable
https://github.com/modm-io/cmsis-svd-stm32