I just downloaded the June 2020 copy of Vanish Magazine and now it is a dual page version. Its not the only magazine that does this but I have noticed it isn't as easy to read on different devices. Was this a change for the physical production or one for the online product?

You have to change your setting in the PDF reader program you are using, so you can view single pages if you like. It is usually under the view topic at the top of your program, How you view it on your device is not automatic.