Hi this is more of a bug report than a feature request.
I am unable to click on the 'Constraint to custom type' dropdown while configuring the Content Relationship field. Clicking on the field has simply no effect. I opened the developer console in Chrome and there is a javascript error logged in the console:
This happens for fields I created a month back (that have a previously selected field in the constrain setting) as well as new content types. It also happens in old workspaces (created a month back) and new ones, across browsers (Chrome and Firefox). This is a major bug that is making the editor unusable for me.