I just discovered a bug regarding the behavior of popovers on a Windows 10 machine running FMPA17.
In layout mode, I have a portal for which child record fields are too many, I decided to put a popover in each row to display all the related fields.
It is impossible to design a large (size bigger than screen when zoomed in) popover when zooming because the focus point always realign itself near the origin (V near the popover button). To circumvent the problem, I arranged all my fields on the side, outside the popover, being able to zoom without any problem then I slid the grouped fields on the popover.
I confirm that the behavior is identical outside a portal.