在使用Angular Mat-Menu和Nx的Storybook插件时，通常会遇到一些兼容性问题。其中一个常见问题是在Storybook中无法正常显示Mat-Menu。

要解决这个问题，需要修改Nx的Storybook配置文件。具体步骤如下：

1. 在项目的根目录中，找到.storybook/main.js文件，打开并添加以下代码：

const { styles: additionalStyles = [] } = require('../src/styles.css');
const { styles: angularMaterialStyles = [] } = require('../node_modules/@angular/material/prebuilt-themes/indigo-pink.css');

module.exports = {
  stories: ['../src/**/*.stories.js'],
  addons: [
    '@storybook/addon-actions',
    '@storybook/addon-links',
    '@storybook/addon-notes/register',
    '@storybook/addon-viewport/register',
    {
      name: '@storybook/addon-docs',
      options: {
        configureJSX: true,
        babelOptions: {},
        sourceLoaderOptions: null,
      },
    },
  ],
  webpackFinal: (config) => {
    return {
      ...config,
      module: {
        ...config.module,
        rules: [
          {
            test: /\.scss$/,
            loaders: ['style-loader', 'css-loader', 'sass-loader'],
            include: [
              path.resolve(__dirname, '../src'),
              path.resolve(__dirname, '../node_modules/@angular/material'),
              path.resolve(__dirname, '../node_modules/@angular/cdk'),
            ],
          },
          {
            test: /\.css$/,
            include: [path.resolve(__dirname, '../node_modules/@angular/material/prebuilt-themes/indigo-pink.css')],
            use: [
              { loader: 'style-loader' },
              { loader: 'css-loader', options: { importLoaders: 1 } },
              { loader: 'postcss-loader', options: { config: { path: './postcss.config.js' } } },
            ],
          },
          ...config.module.rules,
        ],
      },
    };
  },
};

2. 在上面的代码中，通过添加以下行将样式表导入Storybook的配置中：

const { styles: additionalStyles = [] } = require('../src/styles.css');
const { styles: angularMaterialStyles = [] } = require('../node_modules/@angular/material/prebuilt-themes/indigo-pink.css');

3. 然后，在上面的代码中，添加以下行以确保样式被正确加载：

{
    test: /\.scss$/,
    loaders: ['style-loader', 'css-loader', 'sass-loader'],
    include: [
        path.resolve(__dirname, '../src'),
        path.resolve(__dirname, '../node_modules/@angular/material'),
        path.resolve(__dirname, '../node_modules/@angular/cdk'),
    ],
},
{
    test: /\.css$/,
    include: [path.resolve(__dirname, '../node_modules/@angular/material/prebuilt-themes/indigo-pink.css')],
    use: [
        { loader: 'style-loader' },
        { loader: 'css-loader', options: { importLoaders: 1 } },
        { loader: 'postcss-loader', options: { config: { path: './postcss.config.js' } } },
    ],
},

4. 最后，在添加上面的代码之后，重启Webpack服务器和Storybook即可。

通过上述方法，就可以解决Angular Mat-Menu与Nx的Storybook插件不兼容的问题了。