ant-design/components/select/demo/responsive.tsx

import React, { useState } from 'react';
import type { SelectProps } from 'antd';
import { Select, Space, Tooltip } from 'antd';

interface ItemProps {
  label: string;
  value: string;
}

const options: ItemProps[] = [];

for (let i = 10; i < 36; i++) {
  const value = i.toString(36) + i;
  options.push({
    label: `Long Label: ${value}`,
    value,
  });
}

const sharedProps: SelectProps = {
  mode: 'multiple',
  style: { width: '100%' },
  options,
  placeholder: 'Select Item...',
  maxTagCount: 'responsive',
};

const App: React.FC = () => {
  const [value, setValue] = useState(['a10', 'c12', 'h17', 'j19', 'k20']);

  const selectProps: SelectProps = {
    value,
    onChange: setValue,
  };

  return (
    <Space direction="vertical" style={{ width: '100%' }}>
      <Select {...sharedProps} {...selectProps} />
      <Select {...sharedProps} disabled />
      <Select
        {...sharedProps}
        {...selectProps}
        maxTagPlaceholder={(omittedValues) => (
          <Tooltip
            styles={{ root: { pointerEvents: 'none' } }}
            title={omittedValues.map(({ label }) => label).join(', ')}
          >
            <span>Hover Me</span>
          </Tooltip>
        )}
      />
    </Space>
  );
};

export default App;