What Happens When Your Mac Dock Runs Out of Room?
Users report that Apple's Dock shrinks every icon to fit one row when too many apps are open, and Apple Community answers say no setting adds a second row. Moor (macOS 26 Tahoe or later) handles a full dock differently. Icons shrink only to 36 points, then widgets get narrower, and then only the running apps scroll along the dock. You can also set Running apps to Wrap to 2 rows in Settings → Docks. Every app keeps its badge, menu and drag.