Hello,
Sorry to hear about that.
Could you please once disable all the plugins that are not related to our Theme and then check back the issue again. If it gets resolved, then reactivate them one by one to see which Plugin is causing the conflict.
Because we have confirmed from the Test Site, the Save Button is appearing and working fine there. This issue is specifically arising at your end. Also, your Site is on Localhost, so we can’t view it ourselves too.
Best Regards