There’s 2 profiles, each with 3 modes. Eco/Trail/Boost.
For each profile, you can set the max power per mode. Shimano use nM to set the assistance. Min is 20nM, max will be be 85nM.
You can also set the start up which is how aggressively the power kicks in and the assist characteristic which is basically how hard you have to work to achieve the power.
Setting the start up to a high number is perfect for flipping you off the back in steep climbs lol. Setting the characteristic to a low nunber means you’re working harder for the same amount of assistance. Setting it to a higher nunber makes it easier to achieve maximum power.
The 2 profile thing means you can set 2 different versions of eco/trail/boost. It’s handy once you’ve got used to the bike and sometimes feel like you need an inbetween setting where Eco isn’t enough but trail feels like too much.
But yeah, when you’re out riding you choose whichever mode you want. There’s no adaptive power setting that varies it as you ride.