Hi @BenTam-3003 ,Welcome to Microsoft Q&A,
According to the documentation of ColumnHeader.Width Property explain:
This property enables you to set the Width of the ColumnHeader. The ColumnHeader can be set to adjust at run time to the column contents or heading. To adjust the width of the longest item in the column, set the Width property to -1. To autosize to the width of the column heading, set the Width property to -2.
AS:ListView.Columns[0].Width = -1
For the designer, modify it directly as follows:
Best Regards,
Jiale
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