Sorry, my mistake - English is US LOL. Exactly what I find confusing, but I realise (realize

) that it's not unique to Beersmith. FWIW the app only has options to 'Set to Metric' or 'Set to English', which was the source of my confusion in the first place.
What I am saying is that neither US units (pints, gallons etc.) nor Imperial units (different pints, gallons etc.) can be described as English in the modern world. Both derive from the English system of weights and measures that dates from before 1824 but neither is the same as that old English system. So, for completeness, we have Metric (L), US (gal) and Imperial (Gal).