Add a separator by moving the "Separator" instrument to the desired position in the e-mail body.
A form will appear. Set the width and height of the separator. Set the content alignment.
Click on "Appearance" and choose the separator style and the separator's color.
When everything is set, click on the "Confirm" button.
To remove the separator from the e-mail, click on the "Remove item" icon above the separator.
A confirmation will appear.
Click on the "Yes" button to confirm it.
To move the separator to a different position, click on the "Move object" icon, and hold while dragging the separator to the desired position. Then release.
To duplicate a separator, click on the "Duplicate item" icon.
To edit a separator, click on the "Edit item" icon.
A form will appear. The editing process is the same as the creation process.