It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

×
"Hot Key for Spotting Doors and Ground Items: Heart of Winter also provides a hot key (ALT) that illuminates all doors and any items on the ground. When the ALT key is held down, all doors and ground items will be highlighted in blue, similar to the way containers are highlighted."

How to solve this problem?
Use the Command/Apple key. Took me a little while to find it, too.