有什么理由这样查看select吗.箭头图标不可见.我正在使用"@mui/material":"^5.8.6".请帮帮我
<Box sx={{ width: "auto" }}>
<FormControl fullWidth>
<TextField
select
labelId="demo-simple-select-label"
id="demo-simple-select"
value={gender}
label="Gender"
onChange={(e) => setGender(e.target.value)}
>
<MenuItem value="Male">Male</MenuItem>
<MenuItem value="Female">Female</MenuItem>
</TextField>
</FormControl>
</Box>