Administrators and developers often need to customize the Search Layout for both standard and custom objects within their Salesforce orgs. 

Customizing a Search Layout allows users to select the standard and custom fields that are displayed when records from that object appear in various places around Salesforce. Such as when returned in a search, displayed in a lookup dialog or on the recently viewed records list displayed on the tab home page.

Search Layout is a part of Custom object metadata type.

So Custom object must be added to your filter and retrieved in order to deploy changes to Search Layouts.

To customize a Search Layout, locate the object in the Setup menu within Salesforce and select the Search Layouts item on that object (menu on the left hand side).

This is an example of a Search Layout on the Account object:

Following this example, we've made a customization on the Search Layout for Standard User, and now the Search Layout includes: Account Name, Account Site, Phone, Account Owner Alias and Billing Street fields.

Now, when the org (in which the change was made) is compared either to another org or to a Git branch (source control), Gearset will highlight that the Account object has changed.

Deploying the Account object will deploy the Search Layout changes.

It's an expected behaviour to find the Custom object being present twice in the comparison results when looking at the All items tab.
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You'd normally see your Custom object (in this example Account):
- once as Different, including the Search Layout change(s) you made
- and once as No difference.
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Currently, our precision deployments feature doesn't support incremental deployments of the Custom object metadata type - that is if you wanted to only deploy the changes made to your Search Layout on a specific custom/standard object, rather than having to include the entire Custom object to the deployment package.