Remove Heading tags from Wordpress WYSIWYG / Tinymce editor based on category

functions.php

/*
  This function does just what it says.
  Input your category in the in_category()
  Author: Eric Murphy
  URL: https://www.matrixwebdesigners.com/
  REF: https://codex.wordpress.org/Conditional_Tags#A_Category_Page

  You can also use this for other things like pages, etc..
*/

function remove_wysiwyg_tags_based_on_category($arr){
	
	if ( in_category( 'yourCateory' ) ) {
	
    	$arr['block_formats'] = 'Paragraph=p;Heading 3=h3;Heading 4=h4';
		return $arr;
	}
	return $arr;
}
add_filter('tiny_mce_before_init', 'remove_wysiwyg_tags_based_on_category');