There's no right way. They're there to provide the ability to adjust the trim on the fly while riding. I don't know how I'd set the right side, probably near center, but the left I'd set to the tight end, for normal use, allowing me to move it down to trim the FD when tiding outer ring with the chain coming from the inside end of the cassette.
Right is what works for you and how you prefer it. Feel free to see what suits you best.
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