Introduction:

In the above tree menu, you can see that the node "Overview" is highlighted by mauve font and bold style. That is because, through the analysis of tree menu, the link URL of node "Overview" is the same with "index.htm" you are visiting.

Steps:

Click Global Settings > Highlight in Tasks panel and check "Auto highlight current node" option.
The highlighted node is the same as the selected node of mouse out state when the highlight function takes efect; the highlighted node is the same as selected node of mouse over state when the mouse moves over highlighted node.