Yes.
Remove the door panel and then feel up under the wing window and you should find a nut on a stud below the middle of the glass. There should be some washers and a spring above the nut. The spring provides the friction. Tighten the nut up on the stud to provide more spring tension and that should firm up the wing window movement.
HOWEVER, these studs and nuts are typically pretty corroded and the nut may be hard to turn so be careful trying to turn it so you don't break off the stud. A shot of penetrating oil might not be a bad idea.
If the window is really loose, that stud may already be broken off or the spring perhaps has broken.
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