I believe the information stated at the bottom of the screenshot is incorrect and does not apply to the Smart Solar MPPT . (Page 35 ) but i don't have an email address to report it to Victron .
I now use a Smart Solar 150/70 tr MPPT and the option stated to adjust the Multiplier does not apply to it although the manual shows it to be a feature . I previously used an old style Blue Solar MPPT , the larger unit with a small screen and 4 black buttons on the face , on that model the Multiplier could be adjusted as the statement says