The Spread operator allows you to directly move particles in various directions, by adjusting their position instead of applying forces.
X/Y/Z: the overall distance to move particles, in random directions.
± X/Y/Z: controls the amount of variation to apply to the initial X/Y/Z distances.
The noise settings allow you to offset the way in which particle positions are moved.
Strength: the strength of the noise.
Frequency: the frequency of the noise. Increasing this value will evolve the noise pattern over time.
Scale: the scale of the noise.
Roughness: the roughness of the noise.
Iterations: the number of iterations to use to calculate the noise.