I tested this with 3 Nvidia Drivers to see if I could find a driver that works properly. I tested the following Game Ready drivers Version 457.30, 461.40 and the latest, 461.72. The flicker occurred on all three of them.

Tested in //UE4/Release-4.25 @ CL 14469661 and this did occur, so not marking as a Regression.

Steps to Reproduce
  1. Open any project
  2. Navigate to Edit > Editor Preferences
  3. Tick the checkmark on Enable Window Animations

The File, Edit, Window, and Help dropdown menus flicker and are displaced

There would be no flickering after enabling window animations

Have Comments or More Details?

There's no existing public thread on this issue, so head over to AnswerHub just mention UE-110464 in the post.

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ComponentTools - Slate
Affects Versions4.254.26
Target Fix5.0
CreatedMar 10, 2021
UpdatedJun 2, 2021