Josh,
I would guess that Adduartes issue is similar to my own.
Until version 16 I have always run my database windows maximised under Microsoft Windows to avoid the mess that is two sets of window borders and,even worse, the database window half disappearing behind the application window.
So the PC users are used to seeing only a single window at a time. Clearly 16 offers a whole new world of options for window management on PCs, but, initially, I would want to reproduce the former behaviour in 16 before assessing how to take best advantage of the new possibilities. One of my clients might end up with close to 20 full screen windows by the end of a day in 16 compared to a single visible window in 15. Hence my script for hiding all but the active window (I will also need to ensure that windows are lo longer maximised but adjusted to fit instead.)
When I moved for PC to Mac a few years ago it took some time to get used to having so many more windows to deal with and at first it seemed very 'messy' to have so many windows and more difficult to locate the window I was looking for.
My aim is to ensure the migration to FileMaker 16 is a easy as possible for users and then add any additional windows in a considered and controlled manner.
Hopefully you can now understand the issues that SDI raises for some of us on PCs