Click on the eye icon with a line through it:
If you are unsure of the icon to click, you can hover your mouse over the icons to see what the icon is for
The icon will become red indicating that it is hidden from everyone but the coaching staff:
To remove the feature and make viewable again, click the icon again and it will go back to the white/grey color.
Once the game is hidden, the game will still show within your schedule for you/coaching staff; you will only be able to confirm the game is hidden by clicking on that game from your schedule.