Why does this canvaspanel setPadding method fail to change size during umg runtime?

Development Programming & Scripting Blueprint
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Is this canvas inside a Size Box?

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Are there any umg controls that can be resized at runtime?

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Your script was not working because you asked the size box to adjust its padding and you do not even have a size box.

There are too many ways to adjust widget size and all of them work run-time. It really depends on what you want to achieve.

For starters you can literally tell the widget to:

But again, there are specific tools for specific jobs.