how to turn safe search off on safari using guest profile

 1. There is adware installed on your Mac.

     Use  the latest release of Malwarebytes for Mac to remove malware/adware, if installed on your Mac.

     For instructions:  Install Malwarebytes for Mac          Uninstall Malwarebytes for Mac

     Click the “Scan Now” button. Once done, quit Malwarebytes for Mac.

     Restart the computer and relaunch Safari holding the shift key down.

     Remove unknown profiles (1), unknown extensions(2), reset search engine (3) and reset Homepage (4 & 5)

     listed under Additional steps.

2. Additional steps to take

  1. Remove unknown profiles.

      System Preferences > Profiles

      Open System Preferences, click the “Profiles” icon ( a checkmark on a gear) .

      When Profiles pane opens, select the unknown profile and click the minus button at the bottom.

  2. Select and remove/uninstall unknown extensions:  Safari > Preferences > Extensions

      https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac

  3. Reset search engine:    https://support.apple.com/guide/safari/customize-your-search-ibrwe75c2a3c/mac

      Change Home Page

  4. Reset  Homepage.   https://support.apple.com/guide/safari/set-your-homepage-ibrw1020/mac       

    5. Ref: https://forums.malwarebytes.com/topic/236261-how-to-remove-weknow-malware-and-others/

   6. Shutdown the computer from  menu. Start your Mac using the Power button.