We don't project in widescreen, but I am having trouble with stage view on iPads. I don't know if the problem that I'm encountering is te same as the OP's problem; thinking about it, I suspect it isn't. However …
What's happening for me is that stage view starts correctly, in either landscape or portrait modes, but then after a few slide changes, only a small portion of the total screen is visible. Text somehow gets magnified and even with furious scrolling (which a musician who is playing certainly cannot do!) they can't see the whole of what's supposed to be displayed.
I don't have any tablets which aren't iOS devices, so I'm unable to test to see if the same thing happens. I know that a couple of people at church have android and Windows tablets, but I'd prefer to have this sorted before asking for their devices.
Main view works perfectly on all of the iOS devices that I have tried it on.
@AndiNorthrop , I have been getting people who have vision problems to bring their iPads and the result has been fantastic. For them and for me. For me, it means that they have stopped being angry with me, and for that I'm grateful!