Henk,
It depends on what you're playing.
If you're playing practice rounds, you choose the tees you hit from
If playing stroke play it will automatically select the correct tees
However, if you're playing in a tournament that you signed up for before you advanced to Pro, it will keep you on the easy tees in that tournament until it closes (it will also keep green speeds, wind settings etc the same and post your score against amateur scores)
Rob