They are "spring" loaded. There is flat spring that is on one edge of the screen in the channel. Push the screen toward the spring (up I believe) and it will collapse the spring and you can pull the screen out.
I don't know if the windows are the same style as the dual panes but for ours, we open the window far enough to slide the screen a few inches, lift the screen in the channel and pull out in on the bottom of the screen.
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