If you run Steinberg Library Manager, you should see all of the various bits of content listed separately. I don’t know what content you should expect to see for Cubase, but for Dorico the list should be:
• HALion Symphonic Orchestra
• HALion Sonic SE Pro
• HALion Sonic SE Hybrid
• HALion Sonic SE Basic
• HALion Sonic SE Artist
• HALion Sonic Factory Content
• Olympus Choir Micro
If any of those are missing, try running the Dorico Pro 3 sounds installer again.