tauri-app/src-tauri/tauri.windows.conf.json

{
  "tauri": {
    "windows": [
      {
        "fullscreen": false,
        "resizable": true,
        "title": "Vybr (Windows)",
        "width": 800,
        "height": 600,
        "decorations": false,
        "visible": false
      },
      {
        "width": 300,
        "height": 400,
        "decorations": false,
        "url": "splashscreen.html",
        "label": "splashscreen",
        "resizable": false,
        "fullscreen": false
      }
    ]
  }
}