BL touch and ABL

I recently fitted a BL touch to my SV02. I have taken a long time to get it printing, the main problem being that,. having come from Creality printers, I did not realise that any adjustments made needed to be saved, so I just kept getting the same problems over and over. surely sovol could make the fw auto save any changes? Anyway. it is printing very well now as a single extruder printer. I have installed the correct screen and fw for the BL touch, but it appears that the ABL is not working. I cannot see anywhere in the new fw where ABL is mentioned, so it doesn’t appear that I may have accidently turned it off, or maybe not enabled it. Does anyone have any clues about ABL on the SV02 fitted with the BL touch?