Resize Game View - Runescape Style

Hello,

I have been attempting to recreate runescape’s interface which has the reduced game view and a static U.I surrounding it.

Unfortunately, I haven’t found any clear answer as to whether resizing the game view (While still allowing U.I to be build around it) is impossible outside of editing the source code or possible within the capabilities of the editor or blueprints (Without using render targets which seems absurd since it’d render the game twice)

Any assistance on this matter would be greatly appreciated!

Thank you,

Garrett