Multi-project documentation

Hello, how to generate separate documentation for the projects? In src I have 3 projects:

|-src - Project1 - Project2 - Project3

I want 3 tabs with documentation. Thanks for help.

  "metadata": [
    {
      "src": [
        {
          "files": [
            "src/**.csproj"
            "src/**.json"
          ],
          "exclude": [
            "**/obj/**",
            "**/bin/**",
            "_site/**"
          ]
        }
      ],
      "dest": "api"
    }
  ],
  "build": {
    "content": [
      {
        "files": [
          "api/**.yml",
          "api/index.md"
        ]
      },
      {
        "files": [
          "articles/**.md",
          "articles/**/toc.yml",
          "toc.yml",
          "*.md"
        ],
        "exclude": [
          "obj/**",
          "_site/**"
        ]
      }
    ],
}

[superyyrrzz]

@mohaOujda See: #3168

[mbielecki]

EDIT

How to add documentation to menu list?

toc.yml

- name: Project1
  href: api/Project1/

This solution does not work.