Gradebook columns are auto-populated once a student completes an assignment in alta. Before work is completed, columns will need to be manually created by adding graded items to the gradebook.
To change your view in the D2L gradebook so that fewer columns are visible we recommend grouping your assignments into graded categories. By adding assignments within a certain module to the same category, they will appear in the same grouped column in the gradebook. This grouped column can be collapsed so that you are able to view the overall grade in the module per student.