Panels help you organize your tools and settings in the "Mailings" navigation item. You can drag panels out of their dock, place them freely, and snap them back in place. Switch between the different functions by mouse click or by keyboard input (1,2,3,4,5).

If you want to use two panels side by side, you can drag your mailing to the right using the icon so that you still see all relevant mailing content.

"Settings" panel

The "Settings" panel has one very special feature: It changes dynamically based on the content you've activated in the mailing area.