Dialoguebox looked correct in Editor, but excessively huge in Build Version

Here is how to understand all your scaling issues:

Here are the official docs on how to make your UI handle various resolutions and aspect ratios cleanly:

Here are some notes on UI Anchoring, Scaling, CanvasScaler, etc:

Usually you need to choose a suitable ScaleMode and MatchMode in the Canvas Scaler and stick with it 100%. Generally if you change those settings you will often need to redo your UI entirely.

I also use this CanvasScalerOrientationDriver utility to make sharing UI for Landscape / Portrait easier. Read what it does carefully.

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