A POSSIBILITY is as follows. Flat blade screwdriver, stick it in that slot, hold it HARD and turn it a bit. Brake should release and you can slide that stop up a bit and then turn it back to reset the brake. Same on the other side.then set that window again and give it a whack downward with your hand before tilting it in. Sometimes, that bottom piece gets of close to the bottom for everything to engage properly.
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That being why the word possibility was in all caps. That said, that slot needs to be almost straight up and down for the thing to engage properly.....and it isn't. Worth a shot. Oddly enough just used that trick on 4 separate windows in a Habitat house I'm working on and had success but ALSO suggested that it might be best if the windows weren't tilted out anymore! Ron