Flat menu properties - Arrangement
Layout area - Structure
Select Flat menu
Properties dialog / Continue to Arrangement
Horizontal / Vertical
Arranges the menu items horizontally or vertically, respetively.
Symbol as separator between menu items
With this option, a separator will not be inserted between menu items.
With this option, an image will be inserted as a separator.
Opens a dialog
where the image can be selected.
With this option, text can be entered that will be inserted as a separator
between menu items.