I just bought a pet door insert for a sliding glass door.
I'm assuming that it must be installed against the wall, but I cannot figure out how to remove the side panel of the sliding glass door.
The green arrow points to the glass pane I want to remove so I can put the Pet door against the frame where the red arrow is pointing and then put the green arrow pane back against it.
EDIT Adding requested images
Can it be done? Or is the whole thing one piece?