Hinges have been over extended and bent, unfortunately its going to need a pair of hinges now, a simple enough job for a window doctor/service engineer type outfit, expect to pay around £80+vat fitted
Its obviously a new build and the window is from Munster Joinery however the hinges are generic and are readily available from other places like screwfix ect, see my guide on hinge replacement on the windows and doors section of this forum, you will need to remove the opener but it looks like yours is triple glazed so will be extremely heavy, in all honesty i'd leave it to a service engineer and even then they'll probably remove the glass too