Not enough light

What's happening

Variegated English Ivy earns its pale markings from good light; those cream and silver patches hold little chlorophyll, so in dim conditions the plant reverts to plain green to capture what light it can. Low light also makes the vines stretch toward the window with long gaps between small, sparse leaves — the leggy, bare look ivy gets in a dark corner.

How to fix it

Move the plant to a brighter spot with plenty of bright, indirect light — near an east or north window, or filtered south/west light. If your space is genuinely dim, a full-spectrum grow light makes a real difference and is often the only way to keep the variegation crisp. Already-greened leaves usually stay green, but new growth in better light will come back marbled and compact.

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