To make the default RTL version just follow the below steps.

1. Uncomment files in the file. src/assets/scss/app.scss file.

// @import "rtl/structure/structure";
// @import "rtl/components/components";
// @import "rtl/plugins/plugins";
// @import "rtl/apps/apps";
// @import "rtl/pages/pages";

2. Also you need to uncomment below code in mounted() in src/layouts/index.vue file.

// document.querySelector("html").setAttribute('dir', 'rtl');