I think your vscode config and settings and .prettier are not the same. try creating .prettierrc file in your project root and add a prettier config. vscode will automatically pick up the config.

Add all the format-related config in .prettierrc vscode should read the config and format. settings.json is not the right place to add all the prettier config. It'll also be helpful for other team members otherwise when someone commits it'll change the format.

.prettier

{
    "trailingComma": "es5",
    "tabWidth": 4,
    "semi": true,
    "singleQuote": true,
    "printWidth": 120,
    "bracketSpacing": true,
    "jsxBracketSameLine": true
}

.vscode/settings.json

{
    "editor.formatOnSave": true,
    "editor.defaultFormatter": "esbenp.prettier-vscode",
    "[javascript]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "[jsonc]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "[html]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "[javascriptreact]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "[typescriptreact]": {
        "editor.defaultFormatter": "esbenp.prettier-vscode"
    },
    "editor.codeActionsOnSave": {
        "source.fixAll.eslint": true
    }
}

I need to update the .prettierrc in root directory, not the extension settings

{
  "trailingComma": "none",
  "overrides": [
    {
      "files": "**/lwc/**/*.html",
      "options": { "parser": "lwc" }
    },
    {
      "files": "*.{cmp,page,component}",
      "options": { "parser": "html" }
    }
  ],
  "printWidth": 120
}

Run prettier from the command line. If that does what you expect then you can narrow down from there by slowing removing parts of your neovim config.

You're formatting MDX, which is a variant of Markdown. Breaking text to respect the print width in Markdown is considered unsafe by default because this can affect some renderers sensitive to line breaks. That's why Prettier's option proseWrap(docs) defaults to preserve. Set it to always for Prettier to start wrapping text.

The short answer is no, you cannot disable it entirely.

There are, however, a few workarounds, but they have caveats.

To quote an answer from this issue on github: https://github.com/prettier/prettier/issues/3468. printWidth is not a rule but an input into the algorithm they use to generate their output. Meaning, it is required to be there.

One workaround is to set printWidth to a really high number, but although this will prevent lines from breaking, changing this property will affect your entire codebase, causing other lines throughout it to combine into a single line, which is most likely not desired.

Your second option is to disable prettier for a block of code with the // prettier-ignore syntax. The downside to this is that you'll disable all prettier features for this section of the code. Also, I personally don't find it very "clean" to have comments like that all over your code. You can read about how to use the ignore functionality here: https://prettier.io/docs/en/ignore.html

Find .editorconfig file in your project. If exists, add max_line_length = 120 to it.

See "Print Width" in Prettier document https://prettier.io/docs/en/options.html for details