UI drag and drop. In 4.18, the edit window has an offset problem running, and the mouse has an offset. Independent window operation, absolutely no problem. But it affects work efficiency.
The closer the upper left corner of the window in the mouse, the closer the mouse and the drag and drop icon. The closer the window to the lower right corner of the mouse window, the farther the mouse and the drag and drop of the picture. There is no problem in packing or absolutely windows.
Other versions of UE4. There is no problem in the same way.