How to solve to solve Drop down was not selected instead backgroud html editor was responding in flutter?

[enter image description here][1]

Container( height: 40, width: width * 0.57, child: DropdownSearch(

                  dropDownButton: const Icon(
                    Icons.arrow_drop_down,
                    size: 20,
                    color: Color.fromRGBO(155, 155, 155, 1),
                  ),

                  mode: Mode.MENU,
                  showAsSuffixIcons: true,
                  dropdownSearchDecoration: underlineDecoration,
                  showSelectedItem: true,
                  items: DataList,
                 
                  showClearButton: false,
                  onChanged: setselected,
                  selectedItem: this.defaultTemplateOption,
                ),
              )

HtmlEditor( height: height * 0.45, controller: html_editor_controller, hint: "Enter the text here", toolbar: [ Style(), Font(buttons: [ FontButtons.bold, FontButtons.underline, FontButtons.clear ]), ColorBar(buttons: [ColorButtons.color]), Paragraph(buttons: [ ParagraphButtons.ul, ParagraphButtons.ol, ParagraphButtons.paragraph ]), Insert(buttons: [ InsertButtons.link, InsertButtons.picture, InsertButtons.video, InsertButtons.table ]), Misc(buttons: [ MiscButtons.fullscreen, MiscButtons.codeview, MiscButtons.help ]) ], callbacks: Callbacks( onEnter: () { print('enter/return pressed'); }, onFocus: () { print('editor focused'); }, onBlur: () { print('editor unfocused'); }, onBlurCodeview: () { print('codeview either focused or unfocused'); }, onKeyDown: (int keyCode) { print('$keyCode key downed'); print( 'current character count: ${html_editor_controller}'); }, onKeyUp: (int keyCode) { print('$keyCode key released'); }, onPaste: () { print('pasted into editor'); }, ), plugins: [], ) [1]: https://i.stack.imgur.com/1w5rq.png