If “Payroll activities” is a view, you can add it to your home page by creating a personal dashboard:
Go to Customer Service Hub → Dashboards.
Click New → Dashboard (select layout, e.g., 2-column).
In one of the sections, choose View → Select the table/entity that stores Payroll activities → Pick your saved view (e.g., “Active Payroll Activities”).
Name the dashboard (e.g., “My Service + Payroll”) and Save.
Set it as your default home page:
Open the dashboard dropdown, find your dashboard, and click Set as Default.
Option 2 – Pin Payroll Activities View to Site Map
If you want “Payroll activities” directly in the left navigation of the Customer Service app:
Open App Designer for your Customer Service app (Settings → Advanced Settings → Apps → select Customer Service Hub → Edit).
In the Site Map, add a new Subarea:
Type: Entity
Entity: Your Payroll Activities table (or activity).
Save and Publish the app.
Now it appears in the nav, and clicking it can be your starting page.
I hope this will help you.