Related Posts by current category of post

Hello

I use WP Show Post to display related post in single post but I would like to display only posts with the same category of the current post.

Also, I have a lot of categories so it's not pratical to create shortcode for each category.

I know this is not possible with the plugin but I dont know if there is a function or snippet that I can add to display only posts with the same category of the current post.

Thank you