When you save the presentation, one of the 'save as' options is for .pps, a 'PowerPoint show' file. This does not change anything inside the file, but simply tells WINDOWS to open the file as a show. This is only effective if you double click on the pps file icon. The show can still be opened as a presentation file from within PowerPoint.
So simply saving as a pps file will work, a little. As a side note, you can also just rename the presentation file (ppt) to a show file (pps) from file explorer interface and accomplish the exact same thing.
If you are trying to change it to a show file in order to distribute it, there are other concerns you will need to be aware of. Mainly, you will need to insure that everything the presentation will need to run correctly (i.e. linked sounds, movies, viewers, etc.) is included in the distribution.
There are also options available to lock everyone out from being able to modify your presentation when distributed. These vary by PowerPoint version, the newer ones allowing for internal password protection.
So the question comes back to you, why do you need to save the file as a show?
But, understand that anything that can be shown on a monitor can be screen captured and saved, so 'real' protection is not possible.
The best protection method is to make the PPT into and executable file, which will prevent users from making any changes or even seeing the edit screen in PowerPoint.
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