This article demonstrates how to open Arcade in Cubase:
Open Cubase
Right Click in the Tracks area of Cubase
Click Add Instrument Track
In the Instruments list, navigate down to ‘Synth,' select Arcade
Click Add Track
Troubleshooting:
If you're unable to locate Arcade inside Cubase, we recommend rescanning your plugins. Here's how:
Open Cubase
Navigate to Devices > Plug-In Manager
Click the Rescan button as noted in the screenshot below: