Sunburn from direct sun

What's happening

Anthurium evolved under the dappled shade of forest canopy and isn't built for harsh, direct sun. When strong rays hit the leaves through a window, they scorch the tissue, leaving dry, faded, brown-to-bleached patches that don't recover — usually worst on the leaves and flowers nearest the glass.

How to fix it

Move the plant back from the window or to a spot with bright, indirect light, or filter the harsh sun with a sheer curtain. The scorched patches won't turn green again, so trim badly damaged leaves at the base if you want a tidier look; the plant will replace them with healthy growth once it's out of the direct sun.

This is general guidance based on common symptoms; individual plants vary.