The blue arcs are the expression ranges that have been assigned to those parameters. That wavy white vertical line is the ribbon controller that acts as your expression pedal, but it’s controllable by your finger. This video explains it all.
To answer the question on a different level, those might the most powerful tools in the H9. If you choose to go down that rabbit hole, a world of flexibility that is almost unmatched in the pedal world opens up.
There is nothing wrong with using a group of presets as static and discrete sounds. But you can use those controls and an expression pedal to morph between different presets (within one algorithm). Since many algorithms offer multiple effects, you can morph in and out of various effects in real time. It’s a little like having ten hands that can turn up to ten knobs on a normal pedal while you are playing.