how to increase the Iframe width size

Which SuiteCRM version, which theme, which module and which screen?

Can you please share a screenshot? You can paste it here and then give us the link:

And have a look at the code generated by Studio under “custom” dir, for your new module. Maybe you can find the field definition and some setting.

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I don’t know what you’re talking about. I need to understand which module, which view, which part of the view you’re trying to change.