Window won't close

[Jarrowsean]

So the fiance knew that this window seems to drop once opened, but decided to open it anyway and now can't get it closed, any ideas?

 

[diy_fun_uk]

It's difficult to tell going by the pic, is that the ground floor? If yes, and assuming the locks are in the unlocked positions, you should be able to manually manipulate the window back into the frame and lock it, either by going outside and/or holding the handle. In short, jiggle it about

 

[crank39]

When it's nearly closed go outside and give the top corners a gentle thump while someone inside pulling with the handle

What's happened is the pointed parts on the hinge at the top is not locating in the receiver cup but rather it is riding outside of it hence the gap in the window when it gets to that point where it jams up

 

[footprints]

Check both hinges carefully, what often happens it the small plastic bit snaps and the hinge then will not follow the proper angle.

https://thewindowwizard.biz/upvc-advice-and-help/upvc-window-hinge-broken-plastic-slider/