You can restore the layout of the Sections & Documents layout by clicking the Restore button on the Zylpha ribbon.
Before:
After:
There are also two other methods of restoring your Sections and Documents layout. You can find these options by selecting the drop down, just underneath the Restore button. These two options can be seen below:
The "Restore to saved layout" option will restore to the layout the current bundle was using at its last save.
The "Restore to basic template layout" option will restore to the layout found in your basic template.