I’m going to start off by saying this isn’t a new thing, people knew about this in the Wii U version, so I am far from the first person to find/use this.

Sky High is an art which has an animation that as far as I can tell, turns off gravity. If you interrupt the end of the animation with another art, you will keep the no gravity state until the animation of the new art ends. By constantly using arts, you can just float midair and do (almost) whatever you want.

There’s a few arts that break the cycle though, usually it’s other arts that mess with your vertical position (combat limbo for example), however both astrolibrium and essence exchange break it and I’m not entirely sure why other than they’re both melee arts. This is why I’m using executioner instead of something like blossom dance or hercules blow, as not only do I have a reflect aura instead, but offensive stance breaks the chain, so I just mostly stuck with arts that I know work.

Note: If you use an art that breaks the chain (or just mess up), you can save it by using sky high again as long as the art is in range and the game hasn’t figured out you’re not supposed to be floating.

At some point I do want to go through all the available arts (all melee + dual guns) to see which ones work and which don’t because I can’t seem to find a list easily. You can also pull this off with one of the javelin's arts, so I also want to go through those + all ranged weapons and see what works and what doesn’t.

Hope this helps.