How do I add featured items by their Item ID?
Click on the 'Merchandising' link under the 'Website' heading in the Control Panel menu. Then, click on 'Featured Items' tool in the right-side panel.
Step Two: Click the edit icon
Click the 'Edit' icon to go to its settings page.
Step Three: Access the proper tab
Click on the 'ADD ITEMS BY ID' tab.
The featured item page is a results page and is sorted in the default order.
Step Four: Turn on toggle switch
If you'd like your soon to be added 'Featured Items' to take priority, turn on the toggle switch of 'Yes' at the 'When using a manual selection, should the items below take priority in the Featured widget?' prompt, If not, then turn off the toggle switch.

Step Five: Add Featured Item by ID
Enter the ID of the item or items that you would like to feature in 'Search Items' textbox and click on '+ ADD BOOK(s)' button.
Step Six: Save Featured Items
You will see newly added item in the list below. When you are finished, click the 'SAVE' button.