Go to: Settings > Contact lists > Titles, and use one of the following methods: Single row - Click the row action button and select 'edit'. Uncheck the 'active' box, and then save and close. Multi row - In the list check the box(es) on the left of the name column, and then click the multi rows action button. Choose 'Set as not active' option.
The list refreshes and only the active items remain in the list.
Tips:
Use the list filters 'all' or 'inactive' to find the inactive titles.
A strike-out style is applied to all the rows that are inactive.