Render Target Material is clipped as an Image within UMG when attempting to set to fullscreen while playing in Standalone mode.

The interesting thing I noticed about this bug is that the issue is not apparent when using the command console 'r.setRes ResolutionxResolutionf' versus simply pressing the 'Alt+Enter' key.

A simple workaround I suggested was to use the console command instead of the shortcut key. I have added some example images to preview the issue.

Steps to Reproduce

1. Download project attached.
2. Launch the Uproject File.
3. Play in Standalone mode.
4. Use Alt+Enter to enter Fullscreen Mode
5. Observe how the Render Target Image is Clipped/
6. Exit and replay in Standalone again but use 'r.SetRes 1920x1080f' console command.
7. Observe how it is goes fullscreen correctly and the UMG Image is not clipped.

Expected: Alt+Enter works the same as the console command when setting fullscreen mode.

Outcome: Alt+Enter clips the UMG Image

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ComponentUE - Editor - UI Systems
Affects Versions4.
CreatedJun 1, 2015
ResolvedAug 3, 2016
UpdatedJul 14, 2021