How can I remove the “Add New” button in my custom post type?

I have many custom post types that need the Add [custom post type] feature but I have a custom post type of “About” and I do not need to “Add New” about to the about custom post type. So I want to remove the button on top that says “Add About”

This is what I mean:

enter image description here

Any idea how I can remove that?


Please refer below :

function disable_new_posts() {
    // Hide sidebar link
    global $submenu;

    // Hide link on listing page
    if (isset($_GET['post_type']) && $_GET['post_type'] == 'CUSTOM_POST_TYPE') {
        echo '<style type="text/css">
        #favorite-actions, .add-new-h2, .tablenav { display:none; }
add_action('admin_menu', 'disable_new_posts');

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