How do you hide category link on just one post ?

Inspect the page and look at the class attribute on the body tag. You will see something like postid-123. That class is unique to just that one post. You can also see the id number by looking at the browser status bar when highlighting Edit on the post in the admin panel or in the address bar when editing the post.

Set some custom CSS like:
body.postid-123 .entry-categories { display:none; }

To also hide it on the blog page:
body.blog article.post-123 .entry-categories { display:none; }

Thanks I already use .postid-123 .entry-categories-inner { display: none; }
But I will try that for future projects.

template-parts/entry-header.php

find:
if ( true === $show_categories && has_category() ) {

insert a post ID condition

// Conditional examples
$post_id = '11'; //assign post id you are targeting
$ID = get_the_ID();//assign current post ID
$ID === $post_id;  //show only if identical
$ID !== $post_id;  //show if not identical
$post_id = array( 11, 12, 13 ); //array of post IDs 
in_array( $ID, $post_id ); //show only in array

// Multiple conditional statement
if ( true === $show_categories 
  && has_category() 
  && $ID !== $post_id ) {

You can include category name/term_id/slug, or an array of them to check for in has_category($args) if you are targeting a specific category.

• This reply was modified 2 years, 9 months ago by backbone. Reason: typo
• This reply was modified 2 years, 9 months ago by backbone. Reason: typo