Thanks for your reply. However, it didn’t seem to do the trick. To be clear, I’m not talking about anything to do with the background color of nodes that are overdue. I’m referring to the bar in the left margin of the currently selected node (i.e., the node where the cursor is blinking). In the image below, you can faintly see the grayish bar next to the line that begins with “Search for an answer…”
I want to change the color of that bar so that I can more quickly identify where the cursor is on the screen.