This option allows teachers to chose when to post grades to parents and students for a particular assignment. It can be super helpful for a number of situations, particular as it allows you to hide in-progress grades until you decide they're complete, or if you want to release them on a particular date. Let's take a quick look at this new feature:
When you click "Add Column" or on the Edit Column gear, there's an option for whether to publish grades to the parent and student portal:
To enable this feature from the School Admin's account, go to Settings > Turn Features On/Off > click the Configure link for the Report Cards/Gradebook under your plan subscription.
Tick the box next to "Allow teachers to show/hide gradebook columns from parents and students." This works together with the setting "Parents/students can view grade book".