While importing an FBX file, the pop up window which shows the progress (50%) is always displayed in front of all other dialogs and software (including all other virtual desktops). While importing this requires the user to move any windows to use them, like the FBX Import Options window, because the pop up is in the way.
Yes, we are aware of this issue and are working towards a solution.
Unfortunately I do not have a specific time-frame for it as it’s just couple of us community members doing this, unless Epic steps in and fixes this on their own.