bbPress: Turn Off Topic Tags

Removes the topic tags field from the new topic form and hides tag clouds and tag lists, for forums that don't use tags.

Code

if ( ! function_exists( 'bbp_allow_topic_tags' ) ) {
    return;
}

add_filter( 'bbp_allow_topic_tags', '__return_false' );

Existing tags stay in the database and come back if you remove the snippet.

Install WPIDE on your WordPress site (it is free) and open Code Snippets.
Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
It is added inactive: review the code and settings, then switch it on.