  Fluctuations in non-equilibrium systems accumulate over time. Stochastic
resetting, where the state of a system is reset to extrinsically predefined
conditions at random times, is a paradigm for studying the constraint of
fluctuations. Here, we show that cooperative resetting in many-particle systems
can constrain fluctuations in a self-organized manner. We show that systems
where pairs of particles are reset to their mean position exhibit phase
transitions between delocalized and localized states, which exhibit altered
response and improved search behavior compared to extrinsic resetting.
