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I have a kids’ playroom with a big wall and a center window. I want to use this wall as a home theater projector screen. I don’t want to block the window permanently with a fixed screen, and my existing rolling screen is a smaller one.

So I am trying to block the window with temporary plywood from Lowe’s and paint the plywood along with the wall with a white screen painting to play movies.
I want the plywood to be easily removable when I am not playing movies, as I don’t want to miss the ventilation when kids are playing in that room.

What are some options for this? I mean, would buying an exact size of plywood and painting that with matching wall color be a good idea?