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I believe what you want is edge trigger, so that a single movement to one side of the input will cause a single input event rather than continuous motion each frame.
This is generally done in the old input system with the *Down() variants of the calls.
With the new input system I imagine it is something in the bindings for this axis of control. I would work through a few new Input System tutorials to see how they use it to navigate (for instance) a list of discrete items, because obviously they will need that.