Extend default blueprint?

Hi guys,

could anybody tell me how to extend the default blueprint? I just want to add an toggle to the content tab area, but can't get it to work.

It only works out when I overwrite the whole file by copy & pasting it to the local theme.

This is something we are working on fixing. We have a branch in GitHub where this work is going on: https://github.com/getgrav/grav/tree/feature/blueprints-update

We hope to get this added into Grav in the next update (if not the one after that!).