Ensure that you moved the Case object from the Available column to the Selected column.

Hi @Sushmitha B, this should be the module:

https://trailhead.salesforce.com/content/learn/projects/prepare-your-salesforce-org-for-users/customize-the-home-page?trailmix_creator_id=strailhead&trailmix_slug=prepare-for-your-salesforce-administrator-credential

As per @Keiji Otsubo's suggestion the Label of the 'Recent Items' component should be labelled correctly as well apart from including the Case Object in the same..