Hello,

You can change the type size in the second line of price by using the below CSS code in Theme Settings >> Custom CSS >> Global Custom CSS:

.wc-gzd-additional-info span.unit-base{
font-size: 23px;
}

.wc-gzd-additional-info span.unit{
font-size: 23px;
}

Result: https://jmp.sh/8m3xur2

And if you want to change the type of measurement you can change it from here: https://jmp.sh/34gspef

Best Regards.