No. if you do not know how to engage the sunscreen shade of your best half helmet, I suggest reading through the user manual. You don’t want to struggle with your sun shade screen and damage it before you get to enjoy how the model works.
In many models, this type of screen (visor) system only requires a pull-down or push-up to set it in the right position. Most models have self-locking mechanisms that prevent them from slipping out of place.