You can use this white foam board as a reflector in your photography settings.
If you have like shadows on the left side from your setting and at the right size is your window: place the white foam board board at the left side.
The light from your window will reflect the light and you will have less shadow in your setting.
If you fold this foam board in half, it will remain standing.
Size 50 cm x 70 cm,3 mm.