OKay, I show that on the Support systems : (I miss that last time)

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Q: The left (ENGINE) button for the EICAS display is not working, but the EICAS works with all pages using the right (STATUS) button. I cannot blank the screen using ENGINE switch.

A: The issue is one the list for the next upgrade, and is forwarded to our development team. We will do our best to address the issue in the next upgrade.

From: 757 Captain (FSX) / On the list for next SP (QID 3528)

Hope that this will be fixed on the next SP !! :)