It is implemented by adding the sign-out button to the (Atlas_Core-) Atlas_Topbar-template, which is used throughout the application.
Base application is an example app that uses modules ‘Systemmanagement’ and ‘Person’ and some others. You only need to implement Systemmanagement and modify Atlas_Topbar in the same way that it is implemented in Base application.
This is what it will look like with only implementing Systemmanagement:
If you also implement Person and log in using an useraccount that is assigned to a person that has a profile image, it will look like this:
You can create your custom page Layout in “Administration/Atlas_Core” Where you can add a sign out button to top bar by taking header and setting position to right.
Now you can use that page layout wherever you required in your application.
Hope this will help you,
after clicking on the header it is not directing towards anything please guide.