rning: React does not recognize the `startAdornment` prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase `startadornment` instead. If you accidentally passed it from a parent component, remove it from the DOM element. 해결 inputProps -> InputProps 로 변경해줌 에서 아래로 변경 [출처] https://github.com/mui/material-ui/issues/19788
