Yes Marley, when on ehu both starter and leisure battery will charge.
The leisure battery will receive a higher level of charge whilst the starter battery will trickle charge ( which will be sufficient)
I have not looked up the manual to check the specific charge rates…..if you don’t have your own manual, I think that good friend ‘Barry’ may have posted a manual in that specific header section in the menu
Regards and have a good season,
Fred