To hide a column from yourself, locate the column you want to hide. Click the drop down arrow and select Hide Column. The column will now no longer be seen in the normal Grade Center view. To make it visible again, click on Manage and Column Organization. A column that has been hidden will be in grey italicized text such as: Click the columns checkbox and select Show/Hide at the bottom and Show Selected Column.
Note: This will only hide the column from you. Add the Student step above to hide from Students and yourself.
To ignore an attempt, locate the assignment in the Full Grade Center. Click the drop down arrow and select View Grade Details. On the Grade Details page click on the Ignore Attempt button. The student will now be able to resubmit.
Online Learning recommends Ignore Attempt rather than Clear Attempt. With Ignoring the Attempt, you will still have a record of all submitted files and grades.