Tell us what you are trying to do?
Hi,
After I upgraded wp, theme & plugin, when I click "add new products" ( custom post types), my site show : hidden link hidden link
Thanks for that, I have logged in to your site and can see the problem.
If you go to Toolset > Layouts you will see there is a template "Layout for Sản phẩm" assigned to the Sản phẩm post type.
So if you create a new Sản phẩm post it will automatically be assigned that template. (The reason you see the message about the layout in the post content area you shared in your screenshot is because the template does not output the content, and so that message is to tell you that any content you add will not be displayed.)
Now, when I look at your existing Sản phẩm posts I see that they do not use the template. (When you assign a template to some post type, individual posts can override the template setting, and in your case all of the posts appear to override the setting so as to not use the template.)
When I look at the template itself, I see that it is completely empty, it doesn't output anything, so naturally you would not want to use that template for your Sản phẩm posts.
So I have un-assigned the template from the Sản phẩm post type.
Now when you add a new product the normal editor displays.
