How extends template

Hello,
I downloaded pimcore, added my own controller, and added {% extends layout.html.twig %} in the view, but in the bar after breaking my controller, e.g. /admin/example instead of the pimcore template with my text from view, only the profiler at the bottom + black symfony bar is shown and that’s all. How can I use this main template in my controllers?

There is no “main template” you build all yourself but you can check out that example project https://github.com/pimcore/demo it’s showing how to build product listing, some search, pages and so on!