4.5.1 stable VBoxContainer should contain a separation property but it doesn’t appear to. I even enumerated out the properties. I’ve used get_theme_constant("separation", "VBoxContainer") instead for now.
Still new to Godot so am I misunderstanding something?
It isn’t actually a property in BoxContainer, it’s a theme property. So get_theme_constant("separation", "VBoxContainer") (what you’ve got already) is the only way to access it, although you can leave out the second parameter "VBoxContainer" because the theme type of the node is automatically used: get_theme_constant("separation")