Custom layout with preview, but no preview window

[mhartington]

👋 Hi there. I'm working on adaption the vscode layout for colorschemes and cannot seem to enable previews without having a dedicated preview window.

Using this setup:

{
  "folke/snacks.nvim",
  opts = {
    picker = {
      sources = {
        colorschemes = {
          layout = {
            preview = true,
            layout = {
              backdrop = false,
              row = 1,
              width = 0.4,
              min_width = 80,
              height = 0.4,
              border = "none",
              box = "vertical",
              {
                win = "input",
                height = 1,
                border = "rounded",
                title = "{title} {live} {flags}",
                title_pos = "center",
              },
              { win = "list", border = "hpad" },
              { win = "preview", title = "{preview}", border = "rounded" },
            },
          },
        },
      },
    },
  },
},

I'm able to show the theme and the theme file in the preview window. But if I remove the { win = "preview", title = "{preview}", border = "rounded" }, line, I cannot enable colorscheme previews on my whole neovim window. Is this possible?