Factorio Forums

Hello, I browsed through the hotkey combinations and didn't see that setting.

It's the small overlay icons on combinators themselves that display input and output signals the same way recipe/chest contents are displayed when I press Alt key.
I looked everywhere and didn't see how to turn them on again. How do I toggle that overlay?

It is handled by the same view, by pressing the (left) alt key. If a combinator is not showing any signals, it's most likely not been configured with any yet.

If I am not mistaken there is an option under graphics to enable or disable that info on Alt key view.