Notifications Page Search - only searches the title/subject line of the notifications?

Summary:

Does the search on the Notifications Page only search the title/subject line of the notification?

Content (please ensure you mask any confidential information):

For example, here it would only search the title/subject of the notification and not by the initiator name as indicated by the arrow:

Is that true? Is there a way to change this search?

Version (include the version you are using, if applicable):
26A

Code Snippet (add any code snippets that support your topic, if applicable):