Responsive design is a function thanks to which you can hide selected elements on the e-mail template in the dektop and/or mobile version. How to do it?
1. Click on the selected element/block.
2. If you want to hide it in the desktop version, make sure that the Computer tab is active in the menu on the right.
3. Then scroll down to the Responsive design section and click on the slider. It should now be green. The frame that is supposed to be invisible in the desktop version has become foggy.
Use the preview option to make sure it has been hidden.
If you want to hide an element/block in the mobile version, repeat the above steps, making sure that the Mobile tab is active in the menu on the right.
4. Don't forget to save the template!