Find all instances of a detail object and report them to a file

Here is how to do it:

1. Select the detail item.
2. Right-click > Select All Instances > In Entire Project
3. Attempt 'Group' command

It will fail with an error like this:

However the resulting Error Report contains the view names that all these elements exist in...

Click Expand >> and then Export...
Save the Error Report to a file and have fun going through them one by one :-)