In the theme editor, disable mode switching with the presentation in Default mode. Then it will show the side bar no matter what size window is used to display the presentation.
Thanks Jorma, I tried that, and it still disappears once I get it sized down enough. If you increase it, it will reappear though. Just trying to prevent people doing the learning the headache if for some reason they decrease the window size.
This is by design. It turns into full screen mode when window is re-sized after certain limit.
This is done to make the content visible visible clearly always , and hide the sidebar.
Adobe Presenter Engineering Team
Thanks Alpi, I figured that but was hoping:).