1) To change the branch. Click on the hamburger menu (3 horizontal lines) on the top right corner.
2) A sidebar will show up, select the settings button.
3) In settings, you can see various settings, choose the change branch setting.
4) Now, you can see all the branches, select the appropriate one.
5) To verify the branch, click on the top right hamburger button. At the bottom of sidebar, you can see the current branch.
6) Click anywhere on the left-hand side of the screen, or press the back button to see the home screen.