Here's a quick way to inspect which classes you chose via subset selection.
It won't directly show the entire averages and indicate ones that you chose but you see selected ones.
With a little bit of labor, you can compare with your classification and this to tell which ones were selected.
In relion GUI, click on the select job you are interested.
Click Display dropdown and choose _model.star
Check options as you need and click Display button.
Here's an example.
Hope this is useful.