Fullscreen & Windowed Mode From Widget?

Development Programming & Scripting UI
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6

I have tried in Standalone but with no results.
I have a combo box with

Fullscreen
Windowed
options.

I am using the correct combo box variable, getting the selected option Fullscreen (copied correctly from the ComboBox default options elements)
and just like the BP above I am using branch and onButtonPress (an Apply Changes button) ExecuteConsoleCommand only this time with r.FullScreenMode

I have even tried GetDefaultResolution and using an Append with x for x of defRes and f for y of defRes to ExecuteConsoleCommand with no luck.

The Docs just say to use FULLSCREEN but it does nothing.