Kendo React DropdownList 在空按钮旁边显示文本

Question

我正在尝试研究剑道反应 DropDownList 的基本示例。这是我的代码

import React, { useState } from "react";
import "./App.css";
import { DropDownList } from "@progress/kendo-react-dropdowns";

function App() {
  const sizes = ["X-Small", "Small", "Medium", "Large", "X-Large", "2X-Large"];
  const [value, setValue] = useState("X-Small");
  const handleChange = (event) => {
    setValue(event.target.value);
  };

  return (
    <div>
      <div>T-shirt size:</div>
      <DropDownList
        data={sizes}
        value={value}
        onChange={handleChange}
        style={{
          width: "300px",
        }}
      >
        Choose One
      </DropDownList>
    </div>
  );
}

export default App;

我的app.css如下

.App {
  display: block;
  width: 100%;
  height: 100%;
  overflow: auto;
  min-height: 80px;
  box-sizing: border-box;
  padding: 30px;
}

.App-logo {
  height: 40vmin;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  .App-logo {
    animation: App-logo-spin infinite 20s linear;
  }
}

.App-header {
  background-color: #282c34;
  min-height: 100vh;
  display: inline-block;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  color: white;
}

.App-link {
  color: #61dafb;
}

@keyframes App-logo-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.k-dropdown .k-dropdown-wrap {
  height: 26px;
  width: 250px;
}
.k-dropdown-wrap .k-input {
  line-height: 22px;
}
.k-dropdown-wrap .k-icon {
  position: relative;
  top: -4px;
}

.k-input,
.k-picker {
  display: inline-flex;
}

.k-dropdown {
  display: block;
  width: 250px;
}

element.style {
  display: block;
}

但是当我运行它时，我看到下拉选项的文本旁边是一个看起来像空按钮的东西。

知道发生了什么事吗？我什至尝试过完全删除 css，但它就是这样呈现的。网上所有的例子都像这样很基础。