This tilt-and-turn window has disengaged or the top part has come loose.
We see that when the upper hinge is opened it is loose.
We are going to do a test by placing the window in horizontal casement and click on this tab, which is the one that allows us to turn the knob or handle when the window is open.
But we can't get it to settle.
Let's review the top.
The stopper is loose.
This is the drag piece that locks it, but we see that it is loose.
Right here is the problem. The protruding part that causes it to move has come out of place.
Fixing it is easy. To do this, we move the drag piece so that its hole coincides with the protrusion.
We beat him until he comes in.
And ready!
Window repaired!
Thanks a lot.