Hello Bjorn,
Welcome to Atlassian Community. It's nice to have you.
If you are referring to the pop-up box that you get while creating some pages from templates, then those are a function of Blueprints. Essentially, Blueprints are a collection of templates, but have some other actions that have been programmed, such as creating an index page and that pop-up box you are referring to. For more information, have a look at our Blueprints documentation.
You can edit the individual templates within a Blueprint, but not the Blueprint itself. If you want to create your own, then it will require some programming language. You can learn more information about that here: Atlassian Developer > Confluence Blueprints.
Let me know if you have any questions about that.
Regards,
Shannon
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