Should a column of navigation buttons include or omit the current page?

1. What are the main buttons in the navigation bar?
2. What is the use of navigation button?

What are the main buttons in the navigation bar?

The classic Navigation bar has the Recents, Home, and Back buttons at the bottom of your screen. It is the default navigation method on all Galaxy phones and tablets.

What is the use of navigation button?

You can use the navigation buttons to move through menus. There are four navigational buttons that you can use to move throughout a menu: up, down, right, and left. Each button corresponds to the direction that you can move in a menu.