Observational and theoretical evidence supports the idea that the influence of supermassive black hole growth on galaxies extends from the central tens of parsecs (localised, transient impact) to hundreds of kiloparsecs (global, long-term impact). Because of the completely different scales of these localised and global effects on the host galaxies, different observations and experiments are necessary to probe them. The QSOFEED project aims to quantify the effect of the current AGN episode on different properties of the host galaxy by examining the impact of multi-phase quasar-driven outflows and jets on their nuclear regions. I will show recent findings based on our own high angular resolution data from Keck, JWST, and ALMA, and comparison with tailored simulations. While we do not find substantial evidence for the quasars having a significant impact on the global molecular gas reservoirs and star formation rates, they do alter the distribution of cold molecular gas and young stellar populations (ages ≤ 10 Myr, traced with polycyclic aromatic hydrocarbon features in the mid-infrared using JWST observations and with stellar features in the optical using Keck) within the central kiloparsec of the galaxies. The cumulative effect of several of these AGN events might ultimately lead to galaxy quenching.