Working example of multilevel sidebar?

[Goozoon]

Multilevel side has been reworked, i know.
I now try to remake my old version to new, but i cant get it working like it is showcased in Demo picture from this Pull:
#1835

Thank you

[kiaking]

Please provide me your config. It should look like this.

export default {
  themeConfig: {
    sidebar: [
      {
        text: 'Level 1',
        items: [
          {
            text: 'Level 2',
            items: [
              {
                text: 'Level 3',
                items: [
                  ...
                ]
              }
            ]
          }
        ]
      }
    ]
  }
}

[Goozoon]

My previous working sidebar is:

      sidebar: [
                {
                  text: 'Installation',
                  collapsible: true,
                  items:  [
                    { text: 'Preinstall', link: '/preinstall/' },
                    { text: 'CA', link: '/ca/' },
                    { text: 'Server', link: '/server/' }
                          ]
                },

                {
                  text: 'Maintenance',
                  collapsible: true,
                  items:  [
                    { text: 'Backup and Restore', link: '/backup-and-restore/' },
                          ]
                }
              ]

Trying to add submenu under CA and cant figure my head out

[kiaking]

Like this.

{
  sidebar: [
    {
      text: 'Installation',
      collapsible: true,
      items:  [
        { text: 'Preinstall', link: '/preinstall/' },
        {
          text: 'CA',
          link: '/ca/',
          items: [
            { text: 'Sub menu', link: '/ca/path/file' },
          ]
        },
        { text: 'Server', link: '/server/' }
      ]
    }
  ]
}

[Goozoon]

Thank you. Let me contribute to theme-sidebar.md (later today)

[Goozoon]

please, why im getting a horizontal line under and over each Collapsable part? And in your screenshot of example from 'the pull' there is no lines?