Please see attached screenshot.
The RM 12.7.1 release added the filter-as-you-type capability for List attributes, which is very helpful for my customers who have dozens of Target Release values for their code, for instance.
This Idea is requesting an enhancement to add that same filter-as-you-type capability to Group attributes so that users can filter each Group's sub-lists.
For others who might not know, group attributes are basically multi-tiered List attributes that allow you to set conditional selects per which 'tier' of List attribute the user selects. The most common example of data to put in an attribute like this would be State/province and city information so that selecting a state gives you a list of cities in that state.