Tab to choose next autocomplete suggestion

I’m entering people into various assignments, using Calc.
Below each assignment is a list of all the people possible to assign to that task. This speeds me up greatly since all I have to do is start typing the first letter of their name and the rest will autocomplete.
The problem comes when two people have the same first name.

When I was using OpenOffice, I could type the first letter and then hit Tab to switch between the various options. But in Libre Office the tab key simply moves to the next cell. Is there a way to quickly switch to the next option of autocomplete?

Use Ctrl+Tab to forward the suggestion; use Shift+Ctrl+Tab to go in opposite direction.