Question:

How to hide blocks from administrator?

Jade: 2 weeks ago

I need to hide some blocks from priviledged user so he won't be able to attach them to regions via the Block layout. What is the proper way of doing this?

Answer:
Maya: 2 weeks ago

Please open a feature request in the core queue for 'no ui' blocks. This currently does not exist but it's an interesting (and probably necessary one).