Can I see a substance's hazard classification without opening it?

Yes — the Substance Library table shows each substance's GHS Hazard Codes 1 and its hazard pictograms 2 right in the list, next to its CAS number (or “No CAS number” label, for substances added without one). That's the same classification data used when you add that substance into a mixture or an SDS, so you can compare hazards across your library at a glance before deciding what to build with.