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Menu anchors in full screen applications are avoiding collisions with the taskbar even though it isn't on screen.
FSlateApplication::CalculatePopupWindowPosition() has this line...
const FPlatformRect PlatformWorkArea = PlatformApplication->GetWorkArea( AnchorRect );
Fortnite chat panel has a button on the left that brings up the chat channels. It shows the popup too high because it is avoiding the taskbar's footprint.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-5772 in the post.
|UE - Editor - UI Systems - Slate
|Nov 24, 2014
|Feb 9, 2017
|Apr 27, 2018