If there are configured action buttons in the sheet (including custom buttons and mail merge), they can be added into the fields.
If your sheets have existing Action Buttons, you can drag and drop them from the left sidebar into the fields.
Alternatively, right-click on an empty field and select Insert Action Button from the menu.
This allows you to place Action Buttons wherever you want.
After creating Action Buttons, you can also add them as fields on the Listing Page.
In Listing Page Design Mode, use the Listing Page Field Picker to add Action Buttons as Selected Fields.
This enables you to directly execute the Action Button on the Listing Page without entering the Form Page for each record.