I don't believe that the mirroring an iPhone to a Mac—has a direct dependency on the specific versions of iOS 18.5 or macOS 15.5. While it’s always possible that certain enhancements or bug fixes are bundled with system updates, the core functionality of mirroring seems to be governed more by device compatibility, settings, and AirPlay protocols rather than the OS version alone. Therefore, if you're experiencing issues, it's likely due to other factors such as network configuration, AirPlay settings, or temporary glitches rather than something inherent in the updates themselves.
Open the iPhone Mirroring app on your Mac, then choose iPhone Mirroring > Settings from the menu bar at the top of your screen. Choose from these options:
iPhone Mirroring: use your iPhone from your Mac
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