Making a powerpoint that's supposed to show a before and after of a website. Since it's currently a long website I'd rather make a single long slide to put it on (20" instead of 7.5"). But all the other slides in the presentation should be normal-sized.
I found Slide Size (Design ribbon, Customize section) but that resizes ALL slides.
Although you cannot use different sized slides in one PowerPoint file, for the actual presentation you can link several different files together to create a presentation that has different slide sizes.
The process to do so is as follows:
Reference to Office Support Page where this solution was first posted. https://support.office.com/en-us/article/can-i-use-portrait-and-landscape-slide-orientation-in-the-same-presentation-d8c21781-1fb6-4406-bcd6-25cfac37b5d6?ocmsassetID=HA010099556&CorrelationId=1ac4e97f-bfe6-47b1-bab6-5783e78d126d&ui=en-US&rs=en-US&ad=US