and sorry for another presumably stupid question:
Is there any restriction, condition, requirement, limitation etc. for the "Main page content" block to show up in the block list ("Add block" popup) when trying to add a block to a region?
In my project, this block is visible/available on the default layout – even if I change the layout template, and even if I choose a custom template, and I can put it to any region. But this block does not appaer on any other layout, regardless which layout template is used: Search for "Main..." in the block list returns "No blocks match your search."
I notice the same behaviour an a fresh test-installation, so I don't think this is specific to my project.
Any help/advice is, as always, much apreciated!