Display meta box on front end

Use this code

$schema_group = rwmb_meta( 'schema_group' );
$schema_knvb = isset( $schema_group['schema_knvb'] ) ? $schema_group['schema_knvb'] : '';
echo $schema_knvb;

for more detail check the “Meta Box Group” page on the plugin documentation https://metabox.io/docs/meta-box-group/#section-how-to-get-meta-value-of-a-sub-field

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