Remove Activity Filters

yzc_remove_activity_filters.php

<?php

/**
 * Remove Activity Filters.
 */
add_filter( 'bp_get_activity_show_filters_options', 'yzc_remove_activity_filters', 999 );

function yzc_remove_activity_filters( $filters ) {

    // Get Forbidden Post Types.
    $posts_types = array( 'activity_giphy', 'activity_update', 'activity_link'  );
    foreach ( $posts_types as $type ) {
        if ( isset( $filters[ $type ] ) ) {
            unset( $filters[ $type ] );
        }
    }

    return $filters;
}