How do I set a block title to the title of a referenced node?
In Views, with a block output &amp; Content Entity Relationship set up, in 'Contextual Filters':

WHEN THE FILTER VALUE IS AVAILABLE OR A DEFAULT IS PROVIDED
- Override title (tick this &amp; I used %1 with some text)

which offers "Override the view and other argument titles. Use "%1" for the first argument, "%2" for the second, etc."