Being very new, I'm using a number of tutorials to assist my learning. In many such, in both AP and AD, when they move their cursor along either the horizontal or vertical edge of the page, the center lines of the page pop-up, usually in green lines. Mine is not doing that.
I've added a pixel layer, and doesn't matter if I'm using the pen tool, brush tools, or gradient tool, as I pass along the edges it still does indicate center lines.
Where is the setting for turning this one??
Here is the URL of a tutorial that describes it early on: