change textfield size material ui code example
Example 1: textfield font size material ui
<TextField
label="input label name here"
margin="normal"
inputProps={{style: {fontSize: 40}}} // font size of input text
InputLabelProps={{style: {fontSize: 40}}} // font size of input label
/>
Example 2: material ui width textfield
// Option 1
<TextField style ={{width: '100%'}} />
// Option 2
<TextField fullWidth />