WebListBoxColumnData.Width
From Xojo Documentation
Property (As String )
aWebListBoxColumnData.Width = newStringValue
or
StringValue = aWebListBoxColumnData.Width
New in 2020r1
Supported for all project types and targets.
or
StringValue = aWebListBoxColumnData.Width
New in 2020r1
Supported for all project types and targets.
Indicates how wide the column should be when it appears in the WebListBox.