How can I get rid of the automatically generating tags?

by

If you use a child theme, just add this function to your functions.php file:

add_action( 'after_setup_theme', 'foobar_setup', 11 );
function foobar_setup() {
  global $editor_styles;
  $editor_styles = array();
}

This works for me for details follow below links which I used as source of this solution :

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