I want to access the viewport container's> Size Flags > Horizontal > Expand via gdscript.
I can't find how to do this with Doc. Both online docs and Godot engine's documentation is missing info regarding this. Does anyone know.
A screenshot below if you didn't fully understand my question.

When I did $ViewportContainer.sizeflagshorizontal did come up but after that when I do a . and nothing appears after that. And the documents don't have a sizeflagshorizontal either. Any ideas?