The Navigation Tabs on the right hand side in the Header Frame allow you to access the various functionalities of Science of Synthesis.

Using the two tabs in the top row, you can switch between Science of Synthesis and its Electronic Backfile. On start up, Science of Synthesis is active by default.
Using the lower row of tabs in Science of Synthesis, you can switch between:
The tabs in the lower row change when you are within the Electronic Backfile.