Global Search is the search mechanism that should be used to find case comments from within the Lightning Service Console. Global Search is a feature that allows you to search for records or information across multiple objects and fields in Salesforce. Global Search can be used to find case comments by entering keywords or phrases in the search box at the top of the Service Console. Global Search can also be used to filter the search results by object, owner, date, or other criteria. Verified References: [Service Cloud Consultant Certification Guide & Tips], Search for Information in Salesforce