Sometimes the Settings menu fails, but the Devices window works. Go to > Devices and Simulators . Select the Simulators tab. Click the + button to add a new simulator.
Temporary outages on Apple’s server side can cause the list to appear empty. Step-by-Step Solutions 1. Add via the "Platforms" Tab xcode no operating systems available for download
When Xcode says "No operating systems available," it’s usually a sync issue. Manually downloading the runtime from the Developer portal is the most reliable "nuclear option" to get back to coding immediately. To help you get the right simulator version: Which are you currently using? What macOS version is your machine running? Which iOS version are you trying to download? Sometimes the Settings menu fails, but the Devices
Your version of Xcode may be too old to support the latest runtimes, or too new to support legacy versions. Click the + button to add a new simulator