There is a strap attached near the top of the centre rear seat. Pull this strap to fold out the rear centre armrest.
The centre armrest can provide additional arm support but also contains a hidden cup holder with two slots.
To access the cup holder, press the button on the centre armrest near the cup holder lid and let go. The lid of the cup holder opens up. Gently close it manually when the cup holder is not in use.
Small item storage
There is also a small compartment you can use to store your phone or other small items. To open the armrest storage, press the button under the storage compartment lid and the lid will open slightly. Lift the lid manually to open it fully.