How to lock the aspect ratio of the viewport, but the window resolution is changeable, like this
Long time since you asked this, but for those coming later, I think this is probably what you are looking for: Set Constraint Aspect Ratio | Unreal Engine 5.5 Documentation | Epic Developer Community
That will make it so that there will be black bars if the aspect ratio and the current resolution don’t match.
EDIT: Updated link
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