The option "Add Group" is not visible in Home Page.
SAP Cloud for Customer
In home page settings the "Show cards in Groups" setting is disabled.
As an administrator, under home page settings you can enable the users or roles to group cards on their home page. To do so, check the checkbox Show cards in Groups under settings.
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Home Page, Add Group, Show Cards , KBA , LOD-CRM-HOM , Home Page , How To