It’s a sliding patio door, with a bag of charcoal for their grill outside. You can see the vertical blinds hanging in the top left corner, which apartments frequently use to cover patio doors like this:
They simply opened the blinds to the side to get better lighting.
And the wooden dowel in the bottom of the track is used like a door bar, to keep burglars/home invaders from opening the door even if they manage to jimmy the lock:
They’re wearing jeans and a green jacket. You can see an arm in the bottom right corner, holding the plate. My guess is that they were looking for better lighting, and the sunlight from the patio door was the best spot they had.
It’s a sliding patio door, with a bag of charcoal for their grill outside. You can see the vertical blinds hanging in the top left corner, which apartments frequently use to cover patio doors like this:

They simply opened the blinds to the side to get better lighting.
And the wooden dowel in the bottom of the track is used like a door bar, to keep burglars/home invaders from opening the door even if they manage to jimmy the lock:

They’re wearing jeans and a green jacket. You can see an arm in the bottom right corner, holding the plate. My guess is that they were looking for better lighting, and the sunlight from the patio door was the best spot they had.
You’re that character they bring in to solve the weird murders.
That was a very high quality and detailed analysis, well done