Let me disable or hide the calendar tab
David Brown commented
Can you remove the entire Calendar from the app. I have disabled all calendars that are linked to my accounts, but I still have the Calendar in the tab bar. At the same time you can then move the search button to the top and remove the tab bar all together.
The reason being that I already have a better Calendar app on my device and I do not see the point of having the calendar in the app.