The filter is folded, left over right, for example, at least once, maybe again before it can be inserted into the mask where it is unfolded to much the way it appears here..
The mask is to protect others by reducing the range of expulsion from meters to centimeters, when you sneeze or cough. (It's not the cough that carries you off , it is ... )
The visibility of the mask makes others aware of how seriously you treat this matter and make it easy to achieve the social distance of 2m. And thus you, too, achieve some degree of protection.
Now go wash your hands
So that is a health warning
Take care, respect each other, stay safe and well,