The button is empty (no ::before content like other mce toolbar buttons)
There is no way to hide the button (it should be allowed somehow, on the user profile for example).
Advanced editor tools (https://wordpress.org/plugins/tinymce-advanced/) is another possible way to manage the icon (it's how I manage the rest of the icons in that toolbar), however it's not on the list:
The button is empty (no ::before content like other mce toolbar buttons)
There is no way to hide the button (it should be allowed somehow, on the user profile for example).
Advanced editor tools (https://wordpress.org/plugins/tinymce-advanced/) is another possible way to manage the icon (it's how I manage the rest of the icons in that toolbar), however it's not on the list: