How to open PVC double glazed window all the way?

The window is able to swing outward from its vertical position but it is going upto only few centimeter away from its position.


I have seen other windows open all the way from vertical postion to horizontal position.


All windows of my house is not opening all the way so it is not look like jam.


It is Awning kind of window.


It is having hings on the both side of single panel with sreachable arms and a push button handle in middle.How to open PVC double glazed window all the way?
If the windows you've seen that are open all the way are the same design as yours, do the following.





As you open your window, look at the sliding mechanism, as the window 'clicks into it's open position, you should see a small plastic clip that does the 'clicking', if you press that clip in (it's usally black), it should allow you to open the window wider.