When you install Visual Forms it includes an enhanced version of the View Units dialog. 

Enhancements over the existing dialog (some items depend on the current Delphi version):

1. Ability to list all units in the current project group
2. Lists all project source files in the current project group
3. See the forms thumbnail in the dialog
4. Search box to search for units in the list
5. Search box supports matching any portion of unit name (not just the start)
6. Remember of size and position
7. Efficient handling of Arrow, Home and End keys depending on the selected control and content

The following screen captures show the enhanced dialog. 

This screen capture shows the search box string matching abilities.