Specifically it allows you to “quickly” select the preload: rider, rider+passenger, rider+luggage and rider+passenger+luggage. You should feel (& see/hear) the suspension raise/lower.
I strongly suggest that you carefully read the manual as there is a lot of stuff that can be adjusted to suit and it would be a shame to not understand how to make use of it all (that’s what you’ve paid a lot of money for)
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Curently riding
2012 Aprilia RS125 - simple fun
2015 Ducati Panigale 1299S - serious fun
2018 Ducati Multistrada 1260S - fun fun
Kent