By default, the ID numbers in Family Tree Builder are consecutive and set to be the exact amount of people in your family tree.
For example, if you delete a person with ID number 4, then all the people in your tree will be re-indexed, and this ID number will be given to the next person in the list. The total amount of ID numbers will match the exact amount of people in your tree.
Please note: This is different than how the ID numbers worked in FTB 6.0, so after upgrading to FTB 8.0 it is possible that the ID numbers of certain people in your tree will have changed.
If you wish, you can change the ID numbers so that a person's card will get a permanent ID number:
1. Open Family Tree Builder on your computer
2. Select ‘Tools’ on the upper menu bar and click ‘Options’. A new window will open.
3. In the new window, select ‘General’ in the list on the left-hand side.
4. On the right-hand side, use the scrollbar to scroll to the bottom of the list.
5. You can see ‘Show IDs of elements in your Project’ – click on the right column to see the possible options and select the appropriate entry.
To switch to permanent indexing (the old indexing from Family Tree Builder 6.0), select ‘Show Permanent IDs’.
6. Click ‘OK’ to save the changes.
Important: If you switch to Permanent ID numbers, please note that if a person's card is deleted, the ID number for that person will not be used for another person.