@hthsrtdtuk,
This is strange, there should not be such a button for non logged in users. You can check it here: https://wpdiscuz.com/demo/
The button will be visible once the guests make a comment.
Please use the following CSS code to hide the “My content and settings” button for those guests:
#comments .wpdiscuz_unauth .wpdiscuz-user-settings{
display:none !important;
}
The code should be added in the Top Admin Bar > Customize > Additional CSS > “Additional CSS” textarea.
Don’t forget to delete all caches and press CTRL+F5(twice) on the frontend before checking.