Google has applied the new style editor interface for all Gmail users. The new interface with a compact design and many hidden tools that many people feel confused and strange. Currently, Gmail users can temporarily switch back to the old style editor interface. How do the following:
Click on the "Compose" button to open a new email compose window. At the bottom right of the window, click on the arrow to reveal a menu (the menu). Among the options appear, click on the "temporarily switch back to old compose".
This approach helps users temporary switch to the old editor, it is unclear Gmail will offer this option any time before required all users to switch to the new interface.