Codesandbox：https://codesandbox.io/s/mui-datepicker-change-icon-and-its-position-ylzn4n?file=/demo.tsx
为您的字段添加startAdornment的代码：

import { DatePicker } from '@mui/x-date-pickers/DatePicker'
import BugReportIcon from "@mui/icons-material/BugReport";

//...

<DatePicker
  label="mui datapicker"
  slotProps={{
    textField: {
      InputProps: { startAdornment: <BugReportIcon /> }
    }
  }}
/>

更改默认日期选择器图标的代码：

<DatePicker
     slots={{
       inputAdornment: BugReportIcon
     }}
   />

更改图标及其位置的代码：

<DatePicker
  slots={{
    inputAdornment: BugReportIcon
  }}
  slotProps={{
    inputAdornment: {
      position: 'start'
    }
  }}
/>