Since upgrading to macOS High Sierra Spotify has been opening up on computer startup. Found that the Spotify / Preference / Settings / Advance Setting / Startup & Window Behavior / Open Spotify automatically after you log into the computer / option was set to "Yes". Change the setting to "No" serveral times. Each time Spotify continued to open upon computer log in and the option had changed back to "Yes". How can Spotify opening automatically on startup be stopped on an iMac running masOS High Sierra?