Have removed the top cap.. Does not look like i can remove anything to adjust the screen

Can't be removed as it is wrap around to the other side.    

The holes are hollow , tested with a straw able to go through.   

Wow you're very observant ! Removed the cap as per your suggestion. Here are the photos after removing the cap.  

Thanks Jacob Here are the photos. I have removed a cover on the front too.    

Wondering what i should do to lift the shower door up ? Is it a alignment issue or bottom pivot not able to hold door up? We tried to lift the door up ...