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Frontier Forums
I have "trigger" set to primary fire and "tiny little button at the base of the stick" bound to secondary fire.
As the DSS has no secondary fire requirement, I used the secondary fire button in Horizons to activate "view far side of planet" in the DSS. I've got used to it - muscle memory is a real thing.
However, in Odyssey, you can have one or the other. It will unbind from secondary fire if you bind to "far side view".