In your Single Sourc Layout properties there is an option labeled "Show Navigation Link in Topics". You need to clear that option when you generate.
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Hi, Stacy and welcome to the Forum
When you double click on the WebHelp single source layout, a Wizard takes you through several dialogs. On the second dialog, there is a box under Navigation that says: "Show navigation pane link in topic". If you deselect that box and regenerate, your Show link will go away.
Adobe Certified RoboHelp and Captivate Instructor
Ooops, I stepped on you, Rick
Great, thank you!