This can be set in various places in the settings of the category or menuitem.
To be able to border the items, you need to add a class bordered to the css of your template.
In a Cassiopea template this can be added in user.css in the media map of the template.
This is just a example how this can look..
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Example of the screen for selecting a JSW CRM view in the create menu screen in Joomla.
JSW CRM 5 extended Content System for Joomla websites cms