Manage Git branches
In JetBrains Air, all operations with branches are performed in the Branches menu:

It shows the name of the branch that is currently checked out.
Create a new branch
Create a new branch from the current branch
Select from the main menu.
In the Create branch and checkout dialog, specify the branch name.
JetBrains Air then automatically checks out the newly created branch. A blue circle next to the branch name indicates that this branch is currently checked out.
Check out branches
Check out a local branch
To check out one of the local branches:
Select from the main menu.
Select the branch you want to check out and click it.
A blue circle next to the branch name in the list of local branches indicates that this branch is currently checked out.
Check out a remote branch as a new local branch
If you want to work on a branch created by someone else, you need to check it out to create a local copy of that branch.
Select from the main menu.
Select Remote Branches | Fetch.

Select from the main menu.
Click the Remote Branches list and select a branch that you want to check out locally.