Auto-complete textboxes by default show a list of suggestions after the user inputs some text that matches auto-complete data. To select any of those options the user must click one via the mouse or use the arrow keys and press Enter.
When users prefer to select the first option and advance to the next tab, there is a configuration option to change the default behavior.
Where do you save this configuration option? Here.
This configuration option is available with versions of Profound UI later than Version 6 Fix Pack 5.0.