At the moment, is it not possible to remove columns in the family planner, however, you can edit the names you want to show. You can add up to 6 names on your calendar.
This is how you can add or remove names:
- Choose the design you liked
- Click on "Personalize"
- Click on "Family Members" on the top menu
- Enter the names of each of your family members
- Click "Add names"