Today while I had Syrinscape Online selected I pressed Alt-Enter and the app went full screen. If I do it again the app goes into windowed mode but is still “full screen” size with no options to reduce back down to it’s normal small/convenient size.
Woops, this is already reported. Apologies.
That said I found a work around for now.
I just removed the registry entries for screen/reso.
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Yup! That’ll do it. And yes, it’s on our list of issues to fix. 
TO avoid it happening again, just kill the Online Player, before you connect/resize monitors etc and start it up again. Online Player will auto connect seamlessly.