1. Use the context menu (right click) on the Repository title bar (or whichever tab is showing on the left) to Autohide the left hand panels.
The left tab folders are now hidden, leaving you more space to work with the source code in the editor. With Autohide applied the folders are shown with their Standard style i.e. tab folder appearance.
Remember, the tabs can be displayed by clicking on them. When the focus leaves the tabs, they automatically hide again.
To pin the tabs open again, click on the Attach button while the tab is being displayed.