WPF DataGrid - Why the extra column

Question

I have a WPF app that uses DataGrid to display some data. When I run the program there is an additional column as shown here:

Answer 1

Well since its unused space, another way around will be use a weighted width rather than fixed one. You can use a hybrid approach as well wherein some are fixed and some are weighted, in that case ensure one is weighted (*) So in your code it will be :