If you have configured your player template to "Scale presentation to fill browser window," you may find that the navigation hyperlinks in the sidebar are still clickable when you switch to No Sidebar view or Slide Only view even though the sidebar is no longer visible.
This is a known issue. You can correct it using one of the following methods.
Lock the presentation at optimal size
You can workaround this issue by configuring your player template to "Lock presentation at optimal size." Then republish your presentation.
Use a custom SWF to disable the sidebar
If you prefer to allow your presentation to fill the browser window rather than locking your presentation at optimal size, you may be able to workaround this issue using the method described here. Please note that this method is not supported by Articulate.