Customize size of UI.messagebox

You wouldn’t want the dialog to match the length of the sentence and exceed the width of the display.

The UI.messagebox is a very simple method that you can call, with content but not modify a lot. To configure more, you would better get hold of an object reference.

When you create a HtmlDialog, you have such an object where you can configure properties before calling it to be shown.
See here for a minimal messagebox-like example.

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