Safari appears on my iMac from my wife's Mac Mini
Safari appears on my iMac from my wife's Mac Mini, we want my wife's Mac Mini to be unconnected to my iMac. I have gone into her System Preferences and turned off iCloud Safari to no effect - see attached image. Opening Safari on my wife's Mac Mini (Mohave) is quite slow and I am trying to weed out anything that may be an issue.
Mac mini, macOS 10.14