Unable to set tab width to 4 in prettier

First, remove any .prettierrc from the working directory. Because it overrides user settings and uses the default values.

Second, set Prettier: Tab Width to 4.

Third, Unchecked Prettier: Use Tabs

And if you have to use .prettierrc file then specify all the options.

{
    "singleQuote": true,
    "printWidth": 80,
    "editor.formatOnSave": true,
    "proseWrap": "always",
    "tabWidth": 4,
    "requireConfig": false,
    "useTabs": false,
    "trailingComma": "none",
    "bracketSpacing": true,
    "jsxBracketSameLine": false,
    "semi": true
}