How do we install older iOS SDKs in Xcode?

Hi all. I'm writing an app that targets iOS 15 and beyond. I can't build or test because Xcode complains that iOS 17 SDK is not installed, which is true. But my deployment target is set for 15.6.

I installed a simulator for 15 by downloading iOS 15 simulator support from the Platforms tab in settings. This is also where you see that iOS SDKs there are... but there's no way to add them. The + button in the corner only lets you install more simulators.

Where do you install support for earlier iOS versions? This is in Xcode 15.0.1.

Thanks.

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