Change record status: 
Project: 
Introduced in branch: 
2.0.x
Introduced in version: 
2.0.0
Description: 

When a plugin is installed, it affects the appearance and functionality of the entity reference field on the GroupContent entity. This is now taken care off by handlers so that you may easily adjust the label, settings, etc. of said field.

Have a look at src/Plugin/Group/RelationHandler/GroupMembershipEntityReference.php for an example.

Impacts: 
Module developers
Site templates, recipes and distribution developers