Hi @hasan,
You are doing it right already, going into click mode, then loading the page from App Tree.
With click-mode essentially you are interacting with your app just like how your users will be using it. So, when you are in click-mode, navigate to your login page, enter your credentials, then once you have authenticated and landed on your secret-safeguarded page, you just use the App Tree to edit your components of the secret-safeguarded page.
App Tree represents the live page in your page view.
Refer to this post for screenshots and similar explanation - Laravel + Inertia + Vue - #2 by TechAkayy
Let me know how you go. Cheers!