Board Thread:Support Requests - Community Management/@comment-27794543-20190407015110/@comment-5811199-20190408040057

Sorry - I take it back - while there's no way to hide the button 'Add Comment' ('You will be directed to the desktop experience to add a comment'), since they get redirected, they won't see the comment box when they tap on the button.

Just in case you need it - to unhide it for something one off, like to add a comment, you can add  to the end of the URL and it won't load the site CSS.