Glennfun, I think what you mean is that you want a page with a "dry" listing of posts in a certain category, and you don't want to even show that there's a technical facility to comment.
Thing is, that's a theme issue - it's not the Category Show plugin.
What you want to do is to copy your page template with a different name (e.g. nocommentpage.php) and in that "new" page template take out the PHP code segment that shows the comments (and, when applicable as in your case, that they're closed). Then, in the WP page administration part, you set the page on which you have the Category Show list to use the "new" page template. Don't forget to change (or add, if it doesn't have it) at the very top of your new page template the ever-important comment that identifies (i.e. names) your new page template, as appearing in the drop-down list of selectable templates.
If all this seems to you like it's written in a foreign language, start reading up here on how to change or create template files. It's one of the most flexible and powerful parts of WordPress!
Either way, what you want has nothing to do with Felipe Tonello's great plugin.