Restrictions work item in SAP Fiori My Inbox standard apps

Hi All,

I have configured SAP Fiori My Inbox standard apps.

All work item is coming in SAP Fiori My Inbox standard apps Inbox (Leave,travel,time,po,PR)

I want to restrict PO and PR workflow work item from SAP Fiori My Inbox standard apps.

Please provide some input for this requirement,have to do on urgent ...

Refards,

Sameer