Hi @avorster,
Im assuming you have cloned this repo - GitHub - Pinegrow/pg-laravel-inertiajs-tailwindcss: Vue Designer Laravel Inertiajs Tailwind CSS - Quick start template following the youtube tutorial.
The page-view can either be in edit-mode or click-mode and this mode can be toggled via the toolbar.
In click-mode, you can interact with you app just like how you would in an external browser. I covered this at 14:04 in the youtube tutorial.
Enable click-mode, and you can login, then use the app-tree to navigate to the currently loaded component in the authenticated page.
Let us know if you still facing any issues.