All you need to do is to use the screwdriver to lever the emergency. You should keep at it until the window pops up. There is a seal between the interior frame of the window and the window.
How do I remove a travel trailer window?
On the inside of the window, remove the mounting screws. Remove the outer mounting screws, having your helper keep the pane steady. Take out the plastic frame mount, being careful not to let the windowpane to fall. Pull the window glass towards the outside of the RV and set it on the ground.
How do you open an emergency window in an RV?
https://www.youtube.com/watch?v=11U31c8WtI0
Can you open an emergency exit window in a camper?