The mouse is being locked to the viewport when you PIE. The toggle Game Gets Mouse Control (Editor Preferences/Play) does not appear to be working. It seems to always be on. With it off I would expect the user to have to click inside the viewport to give it focus.

Regression: Yes this option worked in 4.10.4

Steps to Reproduce
  1. Open a new blank project
  2. In the Editor Preferences/Level Editor/Play
    1. Turn off Game Gets Mouse Control
  3. PIE

Result: Mouse is locked in the viewport
Expected: Viewport to not even have focus and the mouse free to move anywhere

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Affects Versions4.13
Target Fix4.25
Fix Commit3038275
Main Commit3050870
CreatedJun 30, 2016
ResolvedJan 16, 2020
UpdatedJan 16, 2020