Hi Nicola,
I am sorry, You have waited too long on this.

Please remove any custom code you used earlier and put this in your bp-custom.php

/**
 * Filter is anonymous activity should be allowd.
 *
 * @param bool $is is enabled.
 *
 * @return bool
 */
function bp_custom_anonymous_is_enabled_for_group( $is ) {
	if ( ! bp_is_group() ) {
		return $is;
	}

	$enabled_groups = array( 'alpha-beta', 'abs', 'group-slug-3' );//group slugs

	$group = groups_get_current_group();
	if ( in_array( $group->slug, $enabled_groups ) ) {
		$is = true;
	} else {
		$is = false;
	}

	return $is;
}

add_filter( 'bp_anonymous_is_valid_screen', 'bp_custom_anonymous_is_enabled_for_group' );

Please make sure to change the slug with appropriate once and It will work.

Regards
Brajesh

Thank you Hans.
All the best with the presentation 🙂

Regards
Brajesh

Hi Hans,
Please use this code in your bp-custom.php

add_filter( 'bp_nouveau_get_groups_directory_nav_items', function ( $nav_items ) {

	$group_types = bp_groups_get_group_types( array(), 'objects' );
	$pos         = 25;
	foreach ( $group_types as $group_type => $details ) {
		if ( ! $details->has_directory ) {
			continue;
		}
		$nav_items[ 'group-type-' . $group_type ] = array(
			'component' => 'groups',
			'slug'      => 'group-type-' . $group_type,
			'li_class'  => array( 'no-ajax', 'group-type-' . $group_type ),
			'link'      => bp_get_group_type_directory_permalink( $group_type ),
			'text'      => $details->labels['name'],
			'count'     => false,
			'position'  => $pos,
		);
		$pos + 10;
	}

	return $nav_items;
} );

Regards
Brajesh

You are welcome.

Please check with your theme author.

BuddyPress comes with 2 password boxes now.

Regards
Brajesh