Swap Presenter View not working.

[GridLok]

On our church laptop, someone changed PowerPoint settings so that what shows on the computer screen is what shows on the overhead projector. We used to be able to have PP slides only show on the projector, while Presenter View was displayed on the computer. I followed the recommended procedure to re-establish this state, but when I got to "Swap Presenter View", the options (2) were 'greyed-out' and wouldn't work. As I do not frequently use PP, I am at a loss as to how to regain the facility we once had.