A large fatsia leaf can reach the window even when the pot stands a comfortable distance away. Check the foliage at the glass, particularly after cold nights or a change in sun exposure.
The plant's position is three-dimensional: leaf height, distance from the pane and nearby heating can all differ from the conditions at the pot.
Inspect the marks closely
Record where damage appears and whether it is limited to the exposed side. Look at both surfaces of the leaf and check for pests or residue. Do not assume every mark is caused by light or cold simply because the plant is near a window.
Choose a position suited to the identified fatsia while leaving enough room for the leaves. Avoid rubbing the foliage against curtains or repeatedly folding it aside to reach a handle.
If you change the arrangement, photograph it and watch new growth. Existing damaged areas may remain visible. The purpose of the move is to improve continuing conditions, not to make old marks disappear. Keep watering decisions tied to the growing medium, since a change of position can also change drying time.
NC Extension’s Fatsia japonica profile records leaf browning under unsuitable sun or wind exposure. The RHS houseplant guide adds the risk of cold air behind winter curtains. Use these as possibilities to investigate, not a diagnosis from position alone.
Related reading: Fatsia Japonica Care: Light, Watering and Common Problems.