In some cases, end-users have a difficult time selecting from a large list of options in a combo-box.

In its current form, a combo-box will show ALL the posssible selections when an end-user clicks the drop down. Finding the relevant option can be onerous if there are a large number of options to select from.

In EDIT mode, this problem is addressed by filtering selections based on the text a user has typed into the control box. For example, note that, in the attached screenshot, when a user types in "Aware," only variables that start with that text appear in the combo-box.