How do I turn off visibility to columns for Main Client Users in Aircraft Centre?

How do I turn off visibility to columns for Main Client Users in Aircraft Centre?
1. Login to your account using the username and password provided.
2. Hover over the Fleet Management tab.
3. Click on Aircraft Centre in the drop-down.
4. Scroll down and select the record you wish to view.
5. Scroll back up to the top of the page and select the tab labeled Current Status.
6. Hover over the CONTROLS dropdown and Click on the Column Management option. It will open a new window.
7. Check the column which you want to hide for the Main Client User.
8. Click on the SAVE button to save your changes.
9. It will show you a pop-up window. Click on the OK button.