The BOR thresholds on the STM32G0x1 series can be configured by connecting with STM32CubeProgrammer and changing the option bytes. You can also write code to change it during program start, but that's considerably more complicated, but this only works if it will boot up with the current settings.
It cannot be changed in STM32CubeMX, as that software doesn't connect to the chip or alter option bytes.
The STM32G0x0 series doesn't have a BOR feature.
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