How to Add Parent Key value in New issue view navigator.
Platform Notice: Cloud Only - This article only applies to Atlassian products on the cloud platform.
Summary
The new issue view navigator doesn't allow a view of the parent key during filter search results;
With the new issue view navigator, Click on the filter
Click on view all issues and now search for issues (query - issue type = subtask) using JQL/basic search.
New issue navigator:

Old issue navigator:

Environment
Jira Cloud
Cause
Due to a change in the issue navigator view, now it's not possible to view the parent key field during the filter search results.
Solution
First we need to create a new custom field and then use automation to transfer the parent key value into a custom field from the current parent field. Please check the below steps for your reference.
Navigate to Setting -> Issues -> Custom field.
Create a custom field of text type (parent key) and include all the project screens as per your requirement.
Now, use the automation to populate the value of the parent key field based on the value of the parent field.
Include the parent key field during the filter query search result.
The output of the filter querysearch for your reference.

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