How to Make Pop Up Record Edit Full Width (not Skinny!)

I have added a function to a record which pops the record open to edit in a new tab. This all works fine.

My function is really basic, it just uses the record ID and I took the link from the edit button:

void quote.quoteManager_edit_popup(int inputID)
{
//This function just pops the quote in question open for editing. It is designed to work with the new Quote Page
//
linkURL = "https://creatorapp.zoho.eu/myCompany/appName/formName/record-edit/Quote_Manager_Report/";
//
completeURL = linkURL + inputID + "/";
//
openUrl(completeURL,"iframe");
}

The only part I can't seem to work out, is how to make the pop up record/form FULL width, not skinny as per the below image.

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