You could try putting up window cling film like tis stuff. https://www.amazon.com.au/Rabbitgoo-Window-Static-Decorative-Dazzling/dp/B00RDVD56U/ref=asc_df_B00RDVD56U/?tag=googleshopdsk-22&linkCode=df0&hvadid=341773379746&hvpos=&hvnetw=g&hvrand=9367056099196486679&hvpone=&hvptwo=...
It's very easy to use and comes in many varieties and ranges of transparency. You can take it down and reposition it easily, there's no glue, just electrostatic pressure. I've had some up gor years. Not for birds, just for privacy. Just google window cling film.
Soon leaving it's homelands forever, it's DNA only to survive thanks to backyard birdkeepers. https://www.buzzsprout.com/1072540/5256778-western-rosella-inland-type-aka-red-backed-the-endangered-small-rosella-of-western-australia