Why are some of the specified buttons missing from the CKEditor 5 toolbar?

Hi!

I have an implementation of DecoupledEditor CKEditor 5 in my project:

<script src="https://cdn.ckeditor.com/ckeditor5/38.1.1/decoupled-document/ckeditor.js"></script>

DecoupledEditor
                .create( document.querySelector( '#editor' ), {
                    extraPlugins: [ MyCustomUploadAdapterPlugin ],
                    toolbar: {
                        items: [
                            'undo', 'redo',
                            '|', 'fontfamily', 'fontsize', 'fontColor', 'fontBackgroundColor',
                            '|', 'bold', 'italic', 'underline', 'strikethrough', 'subscript', 'superscript', 'code',
                            '|', 'alignment', 'specialCharacters',
                            'link', 'uploadImage', 'blockQuote', 'codeBlock', 'mediaEmbed', 'insertTable',
                            '|', 'bulletedList', 'numberedList', 'todoList', 'outdent', 'indent'
                        ]
                    }
                } )
                .then( editor => {
                    const toolbarContainer = document.querySelector( '#editor-toolbar-container' );
                    toolbarContainer.appendChild( editor.ui.view.toolbar.element );

But not all buttons are displayed in the toolbar.

There is no code, specialCharacters, codeBlock and so on.

It's the same if I use the ClassicEditor.

Why are these buttons missing and how do I install them?

Thanks!