I am searching how to launch an app in kiosk mode. I have looked at this tutorial How to create your first recipe and enable auto-start using systemd which explains how to launch an app at boot.
I also looked at this tutorial Web Application for Interactive Kiosk Devices but it seems that if you close the browser you still have access to the rest of the device.
My app is either a python app running tkinter or a QT based app.
What is the solution to secure my device ?