如何在新行而不是主行中呈现CKEditor5工具栏按钮？

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        toolbar: {
            items: [
                'heading',
                '|',
                'bold',
                'italic',
                'link',
                '|',
                {
                    name: 'newLineGroup',
                    items: [ 'bulletedList', 'numberedList' ],
                    start: true
                },
                '|',
                'undo',
                'redo'
            ]
        },
        language: 'en'
    } )
    .then( editor => {
        console.log( 'Editor was initialized', editor );
    } )
    .catch( error => {
        console.error( error.stack );
    } );