What are they called? Wall windows?
These large glass panels, that acts like a big screen to the outside, and are generally stationary (cannot be opened or moved) are collectively called stationary windows.
They are also called picture windows or fixed windows. The sole purpose of these glass panels are to provide people with a holistic view of the outside, which was originally made to face picturesque views of mountains or valleys or water bodies. In addition to all that, I also thing they are used to prevent people from feeling trapped or even claustrophobic.
Here are some useful links that might come in handy for your research on the correct word.
In Britain these are called Plate Glass Windows.
This is because they are made of plate glass - which is a technique for manufacturing large sheets of glass.
Any large glass frontage of a shop or restaurant like this is referred to as Plate Glass.