const { searchData, searching, searchValue } = this.state;
<Select
  mode="combobox"
  value={searchValue}
  placeholder=""
  notFoundContent={searching ? <Spin size="small" /> : null}
  filterOption={false}
  onChange={this.onSearchValueChangeHandler}
  onSearch={this.onSearchHandler}
>
    {searchData.map(d => <Option key={d.value}>{d.label}</Option>)}
</Select>

onSearchHandler(value) {
    this.setState({ searchData: [], searching: true });
    setTimeout(() => {
        const results = [
          { value: "aaa", label: "" },
          { value: "bbb", label: "" },
          { value: "ccc", label: "" },
        ];
        const data = results.map(item => ({ value: item.value, label: item.label }));
        this.setState({ searchData: data, searching: false });
    }, 500);
}

onSearchValueChangeHandler(value) {
    this.setState({
      searchValue: value,
      searchData: [],
      searching: false,
    });
}

above is a snippet of remote data access using Select"s onSearch interface. Now you may find a bug, when mode="combobox", the drop-down selection will only show the value value, but when the mode="multiple", will display the label value normally

""