MUI Overrides
Overrides the components of the MUI in the directory src/theme/overrides
styleOverrides
src/theme/overrides/components
https://mui.com/material-ui/customization/theme-components/#theme-style-overrides
defaultProps
src/theme/overrides/default-props.js
https://mui.com/material-ui/customization/theme-components/#theme-default-props
Reference:
src
├── theme/overrides
├── default-props.js
├── components
├── accordion.js
├── alert.js
├── autocomplete.js
├── avatar.js
├── backdrop.js
├── ...
...
Before Overrides (MUI theme)

After Overrides (Minimal theme)

The change will apply globally for MUI component.
This helps you to deeply customize your style, to suit your design.