I’m pretty sure there are no true conditional statements in Niagara. The modules you’re building using nodes are actually using HLSL, which as far as I know it’s not a friend of conditional operators.
Much like when working on shaders or materials, you could store the initial value for whichever parameters you’re changing, and whenever the condition you want is false, just pin those defaults to the result. Here’s an example:
This module checks if MyValue is greater than 5, and if that’s the case multiplies the position by 2. If that’s not the case it changes nothing.