Your plant has ‘wood’ and ‘green’. Wood is the brown woody area at the bottom of the plant. Green is the part that literally is green and is growing on the woody part.
Do you want to grow a wide full plant on which many fresh twigs grow than pruning on the green part of the plant is preferred.
Cut a twig just above the start of a new branch on the green area. When you do not prune the plant will only grow in height and not create more new twigs.
The plant can easily grow 2 meters high and therefore is a very appropriate hedge plant.