I've used the Xcode Simulator many times. But for some reason now (possibly related to the recent OS-X update?) it's not working on my system.
The "OS Version" dropdown is empty and has nothing to select.
The "Create" button is enabled but when I click it nothing happens.
I've followed the instructions on this SO Post:
..but the anomaly is still present.
How can I fix this?
It sounds like you forgot to install the new iOS 17 SDK. This is a separate download from Xcode itself, and is not the same as the previous SDK. Go to Xcode's Preferences -> Platforms and perform the download.