Post category labels, how to show only primary post category?

My posts belong to multiple categories, but only one shows. However, the number of categories that are displayed is not the problem, I would like to display only one, but only the primary category. I try to use filter: add_filter(‘get_the_categories’, ‘my_function); but variable $categories returns empty array.

Is it possible for me to display the primary category of the post or to specify which category will be displayed?

• This topic was modified 1 year, 9 months ago by kristijan.smrekar.
• This topic was modified 1 year, 9 months ago by kristijan.smrekar.