Can Mac OS be downgraded on the new 2020 13" MBP? Catalina is total garbage when it dropped 32-bit support as it has introduced too many compatibility issues.
Apple does not support and OS lower than Catalina for the new 2020 13" MBP, so no Mojave can not be used. I have read there is some possibility of using Mojave in VM, but I have no experience.