尝试将当前样式替换为以下样式：

const dateTimePaperPropsStyles = {
  sx: {
".MuiPickersCalendarHeader-root": {
  display: "flex",
  alignItems: "center",
  justifyItems: "center"
},
".MuiPickersCalendarHeader-root:first-child": {
  order: 0,
  paddingRight: "20px",
  paddingLeft: "20px"
},
".MuiPickersArrowSwitcher-root": {
  display: "inline-flex"
  // visibility: "hidden"
},
".MuiPickersCalendarHeader-label": {
  textAlign: "center"
},
".MuiPickersArrowSwitcher-spacer": {
  width: "220px"
},
".css-31ca4x-MuiPickersFadeTransitionGroup-root": {
  display: "flex",
  position: "absolute",
  paddingLeft: "80px"
},
".css-9reuh9-MuiPickersArrowSwitcher-root": {
  marginLeft: "-2px"
},
".MuiPickersArrowSwitcher-button": {
  paddingRight: "7px"
}
 }
};

link to sandbox