Hello joymats,
Thanks for participating in Apple Support Communities. We understand that you're wanting to turn off the Wi-Fi syncing option between your iPhone and Mac, but the options do not appear for you. Are you using the Finder on your Mac to see these settings? Here are those steps, just in case: Sync content between your Mac and iPhone or iPad over Wi-Fi
If so, have you tried restarting your Mac and iPhone? Restarting can resolve many odd issues:
Restart your iPhone
Shut down or restart your Mac
If the behavior continues, let us know more details:
- Which macOS version and iOS version is installed on your devices? Menu options can vary between versions. For your iPhone tap Settings > General > About to find out. For your Mac, select the Apple menu > About This Mac > Overview.
- How are you connecting to your Mac initially?
The more details you can provide the better.
Take care.