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I believe that you are talking about our HTML-Table-Listing-Reports. I am sorry, but the table reports are not customizable in that way at this time.
We are using a standard table with HTML table element, which means that the width of your columns is adjusted automatically by your browser - to contain the content of the cells.
The table has a minimal width of combined width of all the column heads. If your screen is wider, your browser will automatically try to contain as much data as it can. By default, the table should always try to take the full width of your browser screen.
If I have misunderstood what you are asking about, I apologize. Please explain in a little more detail what you would like to make wider, and we will take a look into what can be done. But if you are asking about HTML table listing reports as they appear when accessed directly, such as this one, then I'm afraid that the width is not customizable.