You don't have to worry about them flying into the window glass? Would think they would like to look out the window instead of being facing into the wall? Thought about perches at the window level? ..
With all of my birds, I let them fly around the room since they were babies, so they couldnt really fly fast enough to hurt themselves. Thats when they all bumped into the glass as they tried to fly through it. After a few times they figured out what glass is and that they cant fly through it lol.
I have a playground set up for them in front of the window. I throw some seed outside for the wild birds to eat. My birds fly to the playground and get super excited when all their buddies show up outside.
But yeah, they love to barely hang off the window trim with their chests touching the wall. Theyre my little clowns lol.
I have a video of them running along in between the blinds like mice haha.