What Signature reads
Open Signature in the sidebar. Recall reads the newest saved set of every project and lists what shows up again and again: instruments and their presets, kicks and snares, samples, effect chains, master chains and plugins.
Read a row
Each row says how many projects use it. Open one to see which projects, so you can go straight to the set where that sound lives.
Keep it current
Signature updates when you save a set. Nothing you do in Signature changes your projects.