Tabbing works great on label columns - you can tab in - start to type your choice, or move up and down with the arrow keys, click enter, then tab to the next cell.
Tabbing doesn’t work at all on drop down lists - you can tab in the field - but the arrow keys don’t work at all, tabbing moves up and down the list, and enter doesn’t fill in the cell, and you can’t tab out without hitting Escape first.
Is there anyway to make these two columns behave the same way?