Putting down your bullshit for good
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This is the entry of Six Paths Senjutsu and it literally says:
Users receive the same benefits and enhancements bestowed by Sage Mode, along with an improved healing factor and the ability to fly.
So:
Rikudo Chakra doesn't make you fly/float.
You have to be a Sage Mode User in order to use the Rikudo Chakra for Six Paths Sage Mode.