[Solved] DataGridView Empty Column or Space

Hi Junarism
Our apologies for late answer

In relation to your question

The area you calls “empty” column is not a column. it’s simply the remainder of the row.

For solution this you can
A. Set the background of the row instead of the setting the background of each cell (which is what shows in his screenshots).
B. Or remove the borders
C. Or make the columns to fill the remainder of the grid
D. Or remove the alternated background in the theme

I attach a sample with these alternatives
Hope that be helpful

Best Regards and happy coding