Does explaining a visual guidance system affect visual attention distribution?
Whether you tell them is going to depend on what you are trying to accomplish. What is the nature of the cues? If they capture strictly exogenous attention, what you tell won't affect how they allocate their attention because orienting is completely involuntary. However, if the cues involve your participants having to decide to redirect their attention, explaining it to them will affect how they allocate their attention and will likely lead to them relying more on your cues.