How to change the link text in Drupal 8 Views?
Here's how I do this (just tested it, working):


Make sure you have a relationship to Entity B added to the view.
Potential gotcha: Make sure your Title field for Entity A is NOT a link already; you won't be able to use it as a title in a link rewrite if it is already a link.  (If you want to rewrite a title that is already a link, you can add a second title, make the second one not a link, and then use that in your rewrite.)
Add a Path field that uses the Entity B relationship.  Rewrite it like &lt;a href="{{ path }}"&gt;{{ entityA_title }}&lt;/a&gt;