How to Synchronize TOC with topic in the right pane

Robo 8 - HTML Help - Navigation Options

Can somebody assist me in understanding from what dialog do you globally enable; synchronize the TOC with the topic in the right pane so that users see where they are in the structure (using the F1 command) when navigating the .chm file?

Download Help indicates; To synchronize the TOC automatically, click the pop-up menu and select Automatically. I'm having some difficulty locating this pop-up menu and Automatic selection item?

Initially, I thought synchronizing of the TOC with topics in the right pane defaults automatically after setting related hyperlinks throughout various topics (then generating) in project? Apparently not?

Any help with this question is greatly appreciated.

Thank you,

robert