a simple way to integrate viewport in a gui layout

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By blurymind
:warning: Old Version Published before Godot 3 was released.

Is there a simple way of achieving this layout in godot, without resorting to gdscript?

mockup

I want the viewport of the game to take about 80% of the window width. The other 20% is for a sprite and some buttons