What is the use of Relation / Field Name?

System Information
  • Strapi Version: 4.0.5
  • Operating System: OSX
  • Database: SqLite
  • Node Version: 16
  • NPM Version:
  • Yarn Version:

What is the use of the highlighted “Field Name” field? I imagine being able to select what field in the relation target is displayed, but it is not possible to change it?

The documentation for Add new Relation does not mention it.

Because it’s a unidirectional OneToOne relation. You should type “block_content” in the left input field.