We removed the plastic panels, too awkward for Willie to operate by herself and hard for both of us to occupy the shower so I could help her. We acquired Command Hooks and two light weight shower curtains with button holes at the top. Cut the length to fit the floor. That way we cover all our shelf items and the door and have the maximum elbow room. Simply fold the curtains back to ONE of the command hooks behind the toilet and the other to ONE of the command hooks at the door when done. You can make them neat by using a strip of velcro to form a circle mid point of the curtains. We use curtains similar to the what the factory supplies for just covering the door. Works for us.
I always shower on the boat, just my preference.